Separate AVI dumps for every time resolution is changed

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Long story short: The current method of AVI dumping that Gens uses for games 
that change resolution multiple times throughout the game is inadequate.

The stretching used by Gens deforms the source and could theoretically be 
scaled better by external scalers, and turning off the aspect corrector will 
simply dump a single AVI (Barring 2 gigabyte splitting) with borders, creating 
a nightmare for encoders to process.

I feel that creating a new AVI every time the resolution changes (Such as the 
style used by .kkapture) will make working with problem games far easier to 
handle, and also possibly increase the quality of files that do need aspect 
correcting in the video stream itself due to the use of more powerful external 
scalers.

Original issue reported on code.google.com by flygonbr...@gmail.com on 5 Dec 2010 at 3:19