video support added and default animations

[vitorregisrr]

Just call the type 'video' and the respective content.

[vitorregisrr]

i found a bug, plz wait to merge.
the video are running with de modal closed.

edit**
this was fixed, i'm searching on show function if there is any video label, if there is, i will play it. same logic on hide, but stoping.

[netgfx]

Please add information on Readme.md as well

[vitorregisrr]

Default animations 'fade' and 'scale' added. But how the game functions dont work when the game is paused, i needed to do a "quick fix". If you guess that it can be made better, just tell me the way.

[vitorregisrr]

The modal position was bugging when the the world bounds is manually setted.
I fixed it on showModal function.
Without the fix:

With the fix: