Updates logic submodule. Refs #34.
Documents analytics policy. Refs #34.
Renames EHSettings_vc to EHPref_units_vc. Refs #34.
Adds placeholder tracking preference pane. Refs #34.
Honors user preference regarding tracking. Refs #34.
Adds base radar graphic. Refs #34.
Adapts radar graphic for preference pane. Refs #34.
Adds button linking tracking help from preference pane. Refs #34.
Merge branch 'feature/t34_no_google_love'