* Make MakeWidget* functions take enum colour
* Make windows A-D use WindowColour enum
* Make windows E-G use WindowColour enum
* Make windows I-M use WindowColour enum
* Make windows N-P use WindowColour enum
* Make windows R-S use WindowColour enum
* Make windows T use WindowColour enum
* Make windows V-W use WindowColour enum
* Fix#11570 - create gfx_draw_string_centered() overload
I created the overload, updated all calls from the old function to the new and deleted the old one
* Use ScreenCoordsXY for window_create function
* Use ScreenCoordsXY for window_find_from_point function
* Use ScreenCoordsXY for window_find_widget_from_point
* Use ScreenCoordsXY for ride_contruction_tool*
* Use ScreenCoordsXY for window_event_tool*
* Use ScreenCoordsXY for window_event_scroll_mouse*
* Use ScreenCoordsXY for remaining window_event*
* Use ScreenCoordsXY for window_(set|move)_position
Clang-format sees the text behind `#pragma region` as code and formats it. Instead of stating the copyright and date there, it's now in the comment block right below it. The text "Copyright" is left in the `#pragma region` line, as clang-format sees it as a single identifier.
I took the opportunity to normalize the dates, and add the copyright notice to the source files where it was missing them (except for third-party and the generated resources.h file).
