- allow setting name of base XDG folder (rename "mycroft")
   - multiple "cores" can co exist now, each with it's own skills folder and config files
- allow setting location and name of .conf files
- allow enabling/disabling XDG support
- optional XDG (configurable, ensure backwards compat)
- dont auto create xdg paths (this was triggering some race conditions that killed the whole process when multiple places attempted to create the folder at same time, a simple string definition should not be creating directories)
- make cache respect xdg
- document "cache_path" in mycroft.conf

fix/set RemoteConf path to cache path

- the property can be used like the regular LocalConf object it subclasses

authored-by: jarbasai <jarbasai@mailfence.com>