Respect xdg directories

[zeenix]

CRC should be following the Freedesktop standard for various directories in the user's home directory. Having own hidden directory in the toplevel home directory is quite old fashioned and not what user's would be expecting. Although the standard itself do not talk of a cache location, ~/.cache has become the de-facto standard after xdg-dirs was adopted.

What this means is that CRC should distribute all the contents it puts under ~/.crc` into the appropriate xdg-dir.

[gbraad]

this would create inconsistency between the platforms we support.
@code-ready/crc-devel WDYT?