Skyrim.py split

Added __init__.py

Added constants.py

Added records.py

Deleted files from game dir
Added remaining comments from skyrim.py
Updated records.py with current tested versions
Import fixes

Module recognised
More import fixes

Import fixes 2 : from ...bolt import _encode, _unicode (as in skyrim.py)

Import fixes 3 : from constants import fid5Conditions

Another missed from skyrim.py: from_iterable
Syntax errors (skyrim/records.py):

- Attempt to fix ModSizeError calls: IIUC couple of calls put size and expected
size in reverse. The rest were syntax errors (unresolved var/attr).
- wrong variable names
- comments by Sharlikran
Removed unused imports from Mopy/bash/game/skyrim/records.py