Bukkit

- NEW: Automatic updates for mods! Fabric and Forge mods supported!
- NEW: Modrinth and Curseforge websites used for downloading mods, with automatic finding of ids.
- NEW: `.check mods` command.
- Alternative updating methods for mods over Github and Jenkins, or custom download url are also supported for mods!
- Added support for velocity plugins.
- Bukkit plugins now have ignore content type set to true by default, since curseforge isn't fixing it.
- Performance optimizations.
- Paths for ./plugins and ./mods directories can be changed in the updater config.
- FIX: Plugin gets excluded (no author) from check even if id/alternative methods are provided #156
- Rework flags/arguments and jar detection #153
- First install: Removed presets. Fast preset is now default.
- First install: Added asking for server start command.
- Removed a lot of general config sections: server java-path, jar-path, flags and arguments. All now in single config section: server start-command. (AutoPlug automatically merges old data to new config)