all: more cleanups

Changes include:
  - extract headers.h from conf.h
  - use "byte" in some more places
  - unify "const" coding style
  - pefile.cpp: make sort order deterministic
  - simplify some other pefile.cpp code
  - CI updates

.github/typos_config.toml

@@ -9,6 +9,7 @@ extend-exclude = ["LICENSE"]
 [default.extend-identifiers]
 # misc variable names & symbols
 acc_spawnve = "acc_spawnve"
+ba = "ba"
 fo = "fo"
 fof = "fof"
 sidelen = "sidelen"