syncing changes from ssc svn, mostly.

[Course.cpp] HasTimedMods() now actually checks for timed mods (technically non-global) instead of being a clone of HasMods()
[Player.cpp] add MAX_HOLD_LIFE/[Player] MaxHoldLife metric
[ScreenGameplay] looking into places to put loading of replay data, perhaps?
[elsewhere] lots of cleanup, and I'm sure there's lots more to be done.
add a todo to ProductivityHelpers.

src/arch/ArchHooks/ArchHooks.h

@@ -107,12 +107,12 @@ public:
 	 * Return true if the application has input focus.
 	 */
 	bool AppHasFocus() const { return m_bHasFocus; }
-	
+
 	/*
 	 * Returns true if the application's focus has changed since last called.
 	 */
 	bool AppFocusChanged();
-	
+
 	/*
 	 * Open a URL in the default web browser
 	 */