Native fadein/fadeout custom animations on lifebars and ellimination of the black screen gap between VS. Screens and fight intros

[shinzankurodraws-oss]

Kinda of a suggestion, linked to the fix you guys did few moments ago.

Like the Capcom crossover games, there were like "door" animations between the VS Screens and the fight intros[as well between rounds, like on CVS1 and 2]. Basically, the idea is to make the very last scene of the VS Screen being the "load" screen until the fight starts[example: the fadeout animation last sprite being locked instead of the black screen that gaps between the VS and the fights, creating a illusion of a smooth transition between the screens]

Also, as a suggestion: A native way to apply fade animations into the lifebars without the need of extra custom files and only appearing exact after the final frame of the win poses.

Thanks once again for the latest fix guys!