The X/Y spinners change the currently tile selected, and reset the element selection index. Previously this would also set the page to default immediately, but since that's now done on invalidation instead, the page would not be correct. This is fixed by checking the index of the selected element too, instead of only the selected page, in the mouse_up event.
The tile inspector window was using its own LIST_ITEM_HEIGHT constant,
instead of the SCROLLABLE_ROW_HEIGHT constant commonly used in other windows.
This fixes CJK text overlapping.
In the invalidate function of the tile inspector, the checkboxes get checked to match the selected tile element. Some of those checkboxes share their widget index with buttons from other pages. When a checkbox is checked, the it's set to be "pressed", which causes the butons in the other tabs so appear that way. This behaviour is fixed by unpressing widgets when switching to another page.
Instead of having to set the page and setup the widgets correctly when a new elements gets selected, it now switches automatically on invalidation to the correct tab. This fixes the issue where pasted elements were selected but the page for them not shown, and removes two of the intents that were made for the tile inspector.
`typedef struct/union/enum name { ... } name_again;` is not needed whe compiling C++, moving the name at the back to be in front of the object and removing `typedef` makes it usable the very same way.
This also replaces typedefs with the using keyword. They have better readability, especially for function pointer types, and would allow more flexibility when used with templates.
With this, entrances and exits that have been moved away from its original XY
location can be made usable. Only one entrance or exit will be usable per
station.
