Codechange: Store animated tile state in map to improve performance.

This allows animated tiles to be added and removed without searching in the animated tile list, providing a performance improvement when there are lots of animated tiles.

Save game version is bumped so that animated tile state can be converted.

docs/landscape_grid.html

@@ -159,7 +159,7 @@ the array so you can quickly see what is used and what is not.
       <td class="bits"><span class="used" title="House is complete/in construction (see m5)">1</span> <span class="used" title="House type (m4 + m3[6])">X</span><span class="free">O</span><span class="usable" title="Activated triggers (bits 2..4 don't have a meaning)">XXX</span><span class="used" title="Activated triggers (bits 2..4 don't have a meaning)">XX</span></td>
       <td class="bits" rowspan=2><span class="used" title="House type (m4 + m3[6])">XXXX XXXX</span></td>
       <td class="bits"><span class="used" title="Age in years, clamped at 255">XXXX XXXX</span></td>
-      <td class="bits" rowspan=2><span class="abuse" title="Newhouses activated: periodic processing time remaining; if not, lift position for houses 04 and 05">XXXX XX</span><span class="free">OO</span></td>
+      <td class="bits" rowspan=2><span class="abuse" title="Newhouses activated: periodic processing time remaining; if not, lift position for houses 04 and 05">XXXX XX</span><span class="used" title="Animated tile state">XX</span></td>
       <td class="bits" rowspan=2><span class="abuse" title="If newhouses active, m7 is the current animation frame">XXXX</span> <span class="abuse" title="If newhouses active, m7 is the current animantion frame; if not, lift behaviour for houses 04 and 05">XXXX</span></td>
       <td class="bits" rowspan=2><span class="free">OOOO OOOO OOOO OOOO</span></td>
     </tr>
@@ -188,7 +188,7 @@ the array so you can quickly see what is used and what is not.
       <td class="bits" rowspan=2><span class="used" title="Random bits">XXXX</span> <span class="free">O</span><span class="used" title="May have pylons">X</span><span class="used" title="May have wires">X</span><span class="used" title="Tile is blocked">X</span></td>
       <td class="bits" rowspan=2><span class="used" title="Custom station specifications ID">XXXX XXXX</span></td>
       <td class="bits"><span class="used" title="Graphics index">XXXX XXXX</span></td>
-      <td class="bits" rowspan=2><span class="free">O</span><span class="used" title="Station type">XXX X</span><span class="used" title="Reserved track">X</span><span class="free">OO</span></td>
+      <td class="bits" rowspan=2><span class="free">O</span><span class="used" title="Station type">XXX X</span><span class="used" title="Reserved track">X</span><span class="used" title="Animated tile state">XX</span></td>
       <td class="bits" rowspan=2><span class="used" title="Animation frame">XXXX XXXX</span></td>
       <td class="bits" rowspan=2><span class="free">OOOO OOOO OO</span><span class="used" title="Railway type">XX XXXX</span></td>
     </tr>
@@ -201,7 +201,7 @@ the array so you can quickly see what is used and what is not.
       <td class="bits"><span class="used" title="Owner of tram">XXXX</span> <span class="free">OOOO</span></td>
       <td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Roadtype for road stop">XX XXXX</span></td>
       <td class="bits" rowspan=2><span class="usable" title="Graphics index">OOOO O</span><span class="used" title="Graphics index: 00 (exit towards NE), 01 (exit towards SE), 02 (exit towards SW), 03 (exit towards NW), 04 (drive through X), 05 (drive through Y)">XXX</span></td>
-      <td class="bits" rowspan=6><span class="free">O</span><span class="used" title="Station type">XXX X</span><span class="free">OOO</span></td>
+      <td class="bits" rowspan=6><span class="free">O</span><span class="used" title="Station type">XXX X</span><span class="free">O</span><span class="used" title="Animated tile state">XX</span></td>
       <td class="bits" rowspan=2><span class="free">OOO</span><span class="used" title="Owner of road">X XXXX</span></td>
       <td class="bits"><span class="free">OOOO</span> <span class="used" title="Tram type">XXXX XX</span> <span class="used" title="Custom road stops specifications ID">XXXXXX</span></td>
     </tr>
@@ -280,7 +280,7 @@ the array so you can quickly see what is used and what is not.
       <td class="bits" rowspan=2><span class="used" title="Random bits">XXXX XXXX</span></td>
       <td class="bits" rowspan=2><span class="used" title="Animation loop">XXXX XXXX</span></td>
       <td class="bits" rowspan=2><span class="used" title="Industry graphics ID (m5 + m6[2])">XXXX XXXX</span></td>
-      <td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Random triggers (NewGRF)">XXX</span> <span class="used" title="Industry graphics ID (m5 + m6[2])">X</span><span class="free">OO</span></td>
+      <td class="bits" rowspan=2><span class="free">OO</span><span class="used" title="Random triggers (NewGRF)">XXX</span> <span class="used" title="Industry graphics ID (m5 + m6[2])">X</span><span class="used" title="Animated tile state">XX</span></td>
       <td class="bits" rowspan=2><span class="used" title="Animation frame">XXXX XXXX</span></td>
       <td class="bits" rowspan=2><span class="free">OOOO OOOO OOOO OOOO</span></td>
     </tr>
@@ -313,7 +313,7 @@ the array so you can quickly see what is used and what is not.
       <td class="bits"><span class="used" title="Random bits">XXXX XXXX</span></td>
       <td class="bits"><span class="free">OOOO OOOO</span></td>
       <td class="bits"><span class="pool" title="Object index on pool (m2 + m5)">XXXX XXXX</span></td>
-      <td class="bits"><span class="free">OOOO OOOO</span></td>
+      <td class="bits"><span class="free">OOOO OO</span><span class="used" title="Animated tile state">XX</span></td>
       <td class="bits"><span class="used" title="Animation counter">XXXX XXXX</span></td>
       <td class="bits" rowspan=1><span class="free">OOOO OOOO OOOO OOOO</span></td>
     </tr>