add docs, move some data fetching to more appropriate class
remove old XP memecrypto support handling, was previously removed due to
net standard/core split
refactor memecrypto to handle multiple save sizes (USUM won't be the
same size save file); placeholder -1 for USUM size
Re-enable PKM (abstract class) property searching via Database/MGDB
search
Closes#1412 (can now search or exclude certain formats)
Add auto-detection for all supported saves (rather than gen3+ except
GC/PBR)
I also added comments where appropriate, because it took far too long to understand what was going on when reviewing the commit that fixed the original bug.
