fix/filesystem_path

[NeonJarbas]

• the path from filesystem was wrong due to a variable name collision, this affected skill data and identity file location
• filesystem was wrongly using xdg_config instead of xdg_data
• refactor identity manager to not use filesystem helper class, that class is meant for skills and now that we are XDG compliant it can not be used or it will move the location of the identity file

point 2 and 3 are bugs that canceled each other out

[codecov]

Codecov Report

Merging #133 (1e0fbfd) into dev (6ceb058) will increase coverage by 2.49%.
The diff coverage is 41.72%.

@@            Coverage Diff             @@
##              dev     #133      +/-   ##
==========================================
+ Coverage   50.35%   52.84%   +2.49%     
==========================================
  Files         119      150      +31     
  Lines       10077     9601     -476     
==========================================
  Hits         5074     5074              
+ Misses       5003     4527     -476     

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 116 more

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[j1nx]

Am I correct that this will solve the mystery created files at the wrong/old home directory?