VENOM-220: Encrypted data file and database

[naxuroqa]

Closes #220

• Add login widget to choose or create a profile
• Input validation in login widget
• Use ToxEncryptSave PassKey to load and save tox data file
• Rename tox .data file to .tox (Same as qtox)
• Move profile data to user data dir (~/.local/share/tox or similar)
• Compile against sqlcipher instead of sqlite3
• Use pass key for database encryption / decryption
• Move ToxSessionIO functionality into Profile.vala

[codecov-io]

Codecov Report

Merging #428 into develop will decrease coverage by 0.04%. The diff coverage is 5%.

@@            Coverage Diff             @@
##           develop    #428      +/-   ##
==========================================
- Coverage     5.97%   5.93%   -0.05%     
==========================================
  Files           78      78              
  Lines         5171    5243      +72     
==========================================
+ Hits           309     311       +2     
- Misses        4862    4932      +70

Impacted Files	Coverage Δ
src/tox/ToxSession.vala	0.55% <0%> (-0.01%)	:arrow_down:
src/core/R.vala	0% <0%> (ø)	:arrow_up:
src/view/ApplicationWindow.vala	0% <0%> (ø)	:arrow_up:
src/core/Profile.vala	0% <0%> (ø)
src/core/WidgetFactory.vala	0% <0%> (ø)	:arrow_up:
src/db/DatabaseInterfaces.vala	5.63% <100%> (ø)	:arrow_up:
src/db/SqliteWrapper.vala	47.53% <71.42%> (+0.06%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e7ec159...1c6dee1. Read the comment docs.