Fixed a bug about jumps in gameplay::Character.
Calibred jump power of character.
Improved integration of physic in gameplay::Character.
Added a method to gameplay::Character to choose the direction of flip.
Exposed to lua the gameplay::Character::setFlip method.
Added way to shrink msize to physic size in gameplay::Character.
Updated move_chara-test.
Added a platform in move_chara-test.