FlxPoint support for log and watch / log security

- added FlxPoint support for log and watch
- added formatFlxPoint() helper function to FlxU
- added security feature to Log.hx to avoid inserting html tags
Log: html tag security improvement

Didn't account for arrays that contain html tags previously
Better logging documentation and more

- Improved documentation for the new logging functions in FlxG a ton.
Especially important since they could be confusing due to showing up as
fields in auto-comletion (FD at least)
- Added formatHash() to FlxU
- Improved help command once more
- fixed bug where FlxG.advancedLog()'s Data param had to be an Array or
would cause an error otherwise
Merge pull request #377 from Gama11/texture_point

FlxPoint support for log and watch / log security