Previously, the players would have their selected skin reset after renaming
the skin textures to the dot separator. This commit implements skin name
migration to ease the transition for server owners.
See 'skins.__fuzzy_match_skin_name' for a detailed explanation.
Supersedes the 'fsep' setting by automatically detecting
the texture name in both, the skin list and the updater
scripts.
New, automatically fetched skins will now always use the
'.' delimiter to avoid player name issues.
In case of ambiguous texture names, a warning is logged.
Adds a filename split seperator setting that lets you choose between old style `_` and `.` because dot is the only char that isn´t allowed in playername but in texturenames.
Default value is `_` to keep it compatible with older versions, while `.` offers a solution to fix #54.
-add skin:is_applicable_for_player(playername) method
- hide private skins in unified_inventory since not supported
- check player assignment in skins.assign_player_skin() + inherited to skins.set_player_skin()
