Skyrim: replace custom trampolines with Microsoft Detours

Fixes SE 1.5.97 where Address Library points to jump thunks that our
hand-rolled instruction decoder could not handle. Detours handles all
x86-64 prologues out of the box.

Removes ~280 lines of custom InsnLength/CreateTrampoline/WriteAbsoluteJump
code and E8 call-site scanning. The global Hook_inflate already detects
one-shot form decompression via total_in==0 check, so form-specific hooks
were redundant.

Also: remove bytesIn tracking, merge double QPC, add logging stop flag,
consolidate version string, remove dead code (FO4 offsets, unused sigs).