Basic support for switching window/fullscreen with Alt+Enter
Create a dropdown for fullscreen in options window. Uses placeholder text.
Add the fullscreen mode to .ini config
Disable resolution option when in borderless fullscreen
Merge pull request #248 from adrian17/fullscreen_mode

[RFC?] Fullscreen mode with Alt+enter shortcut and dropdown option
Merge branch 'viewport' of https://github.com/duncanspumpkin/OpenRCT2 into viewport
Fixed compile error added reference to address