renaming the planescape setup 'action' window controls, because it is just the pause window

this seems pointless, but it paves the way for making an actual actions window to replace the floatmenu

also mandatory for an easy merge
Synching the headers from both instances GUICommonWindows

Also adding the header data and a small function to help it become game-neutral

Nothing of consequence changed yet
Complete restructure of SetupMenuWindowControls to be game version agnostic

Tested with all four games, committed only for bg1/2, iwd1/2
Mundane Changes to the pst version for the sake of being able to compare the update merge
Bring the pst game page button bindings in line with the new version