add InputManager, InputSource, KeyboardInputManager, KeyboardInputSource
add InputManager#activeEventNameSuffix, inactiveEventNameSuffix
bugfix about InputManager#addBroadcastTarget
bugfix about InputManager#flagStore
modify InputManger#addBroadcastTarget
rename Classes
add InputManager, InputSource
modify button event
Merge branch 'feature/input' into develop
modify mixing test html
remove built script files