Mostly: Disabling mods and replace actually works

New features

Support for disabling mods (with a small and awkward language to express conditions)
Allow multiple patch files for the same mod, with the patches property instead of (still supported) patch
location.replace has a check property to check if replace really happened (and how many)
New CLI option for modda install: check-replace=ignore|fail|ask to control the behaviour when the replace check failed. It can also be set in modda.yml (property defaults.check_replace)
Support non-utf8 files for location.replace entries (with annew property, encoding)

Fixes