This is mostly `NULL` -> `nullptr` in cpp files, but I only noticed
because `LanguagePack::GetObjectOverride` and
`LanguagePack::GetScenarioOverride` were returning false instead of real
pointer.
Also fixes some whitespaces, you can `w=1` to github's URL to make it
skip these.
Game speed button with up to 4/5 speeds.
Debugging tools option to enable non-playable changes.
Cheat window is now a setting.
Game speeds 5-7 are removed.
Game speed 8 added with enabling debugging tools.
Windows and news ticker update once per tick instead of based on game
speed.
