Generation of assert patches

[ghost2238]

Write some code to generate assert patches. This will be useful for checking that some code region is exactly what we expect it to be.

Will be useful in cases like this: https://github.com/rotators/Fo1in2/blob/master/Fallout2/Fallout1in2/Mapper/source/scripts/headers/voodoo.h#L255-L256 - Since we aim to be compatible with future sfall versions, if this specific hook ever changes, we can avoid applying the patch and display a loud message instead of overwriting some unknown code.