Sas envelopes: Simplify away some redundant state.
Update README. Avoid recursing the symbolmap lock when we don't need to.
Fix MapFilePath by @unknownbrackets

Fix #5377
Merge pull request #5411 from sum2012/patch-1

Fix MapFilePath by @unknownbrackets
Fix renaming a function from disassembly.
Merge pull request #5405 from hrydgard/envelope-simplifiy

Sas envelopes: Simplify away some redundant state.
Remove call to SetState, superfluous now that the state variables are gone.
Reduce savedata init delay to 200ms