Merge branch 'level_select' into 'master'

Revamped Level Select (platter view)

Seriously revamped every level select instance in the game to use a more attractive and easier to navigate platter view, including:

* Game CLEAR! save (Title/Pause menus)
* Secrets Menu (including custom ones)
* Record Attack/NiGHTS Mode
* Server creation (Online/2P)
* MP Pause level select (Online/2P)

As a result, the layout of the last three above menus has been changed to varying degrees of difference.

Also, bonus feature: using level select (or MAP MAPxx without -force) in Co-op multiplayer won't reset your score, will keep any lives you have above the startinglives variable, and will not take away all your emeralds. The -force thing prevents both warping directly to special stages to rack up the emeralds AND ensures there IS a way to start a new game.

Check out <root>/!LatestSRB2Files/srb2win_branch_levelselect.exe with the latest patch.dta to see more.

Also, LF2_WIDEICON lets you do this. https://gfycat.com/MenacingClearAngora

See merge request !68