spiderfoot: store data and cache in user's home directory

[bcoles]

This change is important.

It may lead to some initial confusion for anyone using the master branch. Short term pain for long term gain.

Your data is fine. Your data in spiderfoot.db is fine. It is still there.

The application is loading data from $HOME/.spiderfoot/spiderfoot.db now. (or $SPIDERFOOT_DATA/spiderfoot.db if you have the environment variable set.)

You can copy/move your old database from /path/to/spiderfoot/spiderfoot.db to $HOME/.spiderfoot/spiderfoot.db to restore all settings and scans.

[codecov-commenter]

Codecov Report

Merging #1343 (e5e46e6) into master (ddc5cd8) will increase coverage by 0.02%.
The diff coverage is 68.00%.

@@            Coverage Diff             @@
##           master    #1343      +/-   ##
==========================================
+ Coverage   53.28%   53.31%   +0.02%     
==========================================
  Files         473      473              
  Lines       38677    38699      +22     
==========================================
+ Hits        20608    20631      +23     
+ Misses      18069    18068       -1     

Impacted Files	Coverage Δ
test/unit/test_spiderfoot.py	97.73% <ø> (-0.02%)	⬇️
sf.py	53.37% <20.00%> (-0.50%)	⬇️
sflib.py	72.97% <100.00%> (+0.11%)	⬆️
spiderfoot/helpers.py	66.28% <100.00%> (+2.26%)	⬆️
test/conftest.py	100.00% <100.00%> (ø)
test/integration/test_sfwebui.py	95.93% <100.00%> (+0.02%)	⬆️
spiderfoot/event.py	100.00% <0.00%> (ø)
test/unit/spiderfoot/test_spiderfootevent.py	100.00% <0.00%> (ø)
modules/sfp_dnsresolve.py	50.44% <0.00%> (+0.44%)	⬆️
sfscan.py	84.00% <0.00%> (+1.09%)	⬆️

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[smicallef]

Should this include an update to .gitignore and .dockerignore?