Update default cache directory to XDG_CACHE_HOME

[NeonDaniel]

Updates default behavior to use XDG cache spec
Updated annotations in default config

TODO:

• Update TTS caching to use /tmp by default https://github.com/OpenVoiceOS/OVOS-plugin-manager/blob/dev/ovos_plugin_manager/utils/tts_cache.py#L225

[codecov]

Codecov Report

Merging #159 (d7a0029) into dev (6ceb058) will increase coverage by 2.71%.
The diff coverage is 42.36%.

@@            Coverage Diff             @@
##              dev     #159      +/-   ##
==========================================
+ Coverage   50.35%   53.06%   +2.71%     
==========================================
  Files         119      152      +33     
  Lines       10077     9801     -276     
==========================================
+ Hits         5074     5201     +127     
+ Misses       5003     4600     -403     

Impacted Files	Coverage Δ
mycroft/audio/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/arduino.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/eyes.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/mouth.py	0.00% <0.00%> (ø)
mycroft/client/speech/__main__.py	0.00% <0.00%> (ø)
mycroft/client/speech/hotword_factory.py	0.00% <0.00%> (-88.89%)	⬇️
mycroft/client/speech/service.py	0.00% <0.00%> (ø)
mycroft/client/speech/silence.py	0.00% <0.00%> (-42.86%)	⬇️
mycroft/client/text/__init__.py	0.00% <0.00%> (ø)
... and 121 more

---

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[NeonDaniel]

• Update TTS caching to use /tmp by default https://github.com/OpenVoiceOS/OVOS-plugin-manager/blob/dev/ovos_plugin_manager/utils/tts_cache.py#L225

It appears the method referenced here is from ovos_utils and already references /tmp

[JarbasAl]

companion PR OpenVoiceOS/ovos-plugin-manager#66

[JarbasAl]

should pin OPM to include PR above, also left a nitpick for the .conf comment