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.
Check for core feature `httpfetch_binary_data` to run the updater properly.
This requires Minetest cb00632 or newer.
README.md: Add documentation for the updater
