Added FlxG.quickWatch() and renamed FlxString.formatHash() to FlxString....

...formatStringMap()

For debugging certain things, logging just isn't very suitable. If you log something in `update()`, the whole window gets flooded and you can't even tell if new logs are being added anymore when the log messages don't change. 
Watch is pretty much the solution to that - but it's really inconvenient when you don't have a var for the value you want to watch. `FlxG.quickWatch()` is basically a log in the watch window. You can push any value to it. It supports formatting `FlxPoint` and `StringMap` data types.  (also added StringMap support for `FlxG.log()`) It can't be edited and is displayed in green. `FlxG.removeQuickWatch()` gets rid of it.