[splittiming] remove GameState "current timing" functions; add compatibility functions to 01 compat.lua

Themes/_fallback/Scripts/01 alias.lua

@@ -20,4 +20,4 @@ local _screen = {
 	h  = SCREEN_HEIGHT,
 	cx = SCREEN_CENTER_X,
 	cy = SCREEN_CENTER_Y
-}
+}

Themes/_fallback/Scripts/01 compat.lua

@@ -63,4 +63,14 @@ end
 
 if ScreenMetric then
 	ScreenMetric = Screen.Metric
-end
+end
+
+--[[ GameState ]]
+--Aliases for old GAMESTATE timing functions.
+--These have been converted to SongPosition, but most themes still use these old functions.
+
+function GameState:GetSongBeat() return self:GetSongPosition():GetSongBeat() end
+function GameState:GetSongBeatNoOffset() return self:GetSongPosition():GetSongBeatNoOffset() end
+function GameState:GetSongBPS() return self:GetSongPosition():GetCurBPS() end
+function GameState:GetSongDelay() return self:GetSongPosition:GetDelay() end
+function GameState:GetSongFreeze() return self:GetSongPosition:GetFreeze() end