gcc 10 no longer lets you get away with not externing global variables in header files. This adds the necessary extern and adds defines in appropriate c files
- Allow SHA to calculate sizes > 16MB and refactor sha function
- Name various registers and magic numbers
- Fix various key access bugs
In a later commit this new design will boost verification times significantly and also allow full SHA256 hashes.
Remove patches_template.ini load.
- It has useless patches, which some times, users confuse them for "bad" patches, even though they aren't.
- No one reads on how it works and it's constantly mishandled when there's no patches.ini (which completely overrides it).
- It was not supposed to be edited.
Also release will not include it anymore.
Template will still exist for demonstrating the syntax of `patches.ini`
This commit also corrects the patches.ini encoding note as ASCII.
