Add processAllKeyboardEvents flag to GameLoopHtml to disable keyboard input while input elements are focused.

Combining the keyboard api of game_loop with input elements cause problems, because the events the input elements receive are also received by the game_loop.
Merge branch 'master' into feature/input_controls_fix
Merge remote-tracking branch 'upstream/master' into feature/input_controls_fix
Move processAllKeyboardEvents out of the constructor to match the style of the other parameters
Fix typo
Merge pull request #49 from Fox32/feature/input_controls_fix

Add processAllKeyboardEvents flag to GameLoopHtml