[stella] Definitive list of bankswitching formats for the 2600

[stella at casperkitty.com]

>>
Short answer, yes :)  Stella is written in C++ and structured using 
classes for each bankswitching type.  The BS type is actually used to 
create an instance of the correct class, so I sort of need it before 
anything is created.  So determining the type has to be from analyzing 
the actual ROM code, not at runtime.
<<

So, define a class which supports either E0 or F8 bankswitching, and
disables support for whichever one isn't used.

>>
Any way to determine this from the raw ROM code?  Is there any 
particular signature that I can search for??  Basically what I need is 
something like how 3F is detected (always does an 'STA $3F' to switch 
banks, so I search for 0x85, 0x3F).
<<

Plan is to recommend that developers put a "4A50" marker at address $1EFE,
but otherwise figure that the reset vector will probably point to code that
does an absolute-mode fetch of an address $6800-$6FFF.  Don't remember
exactly how the decode for that works, but I think it's straightforward.

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