refactor: remove old encryption library

[Chesire]

Remove the old encryption library from the project and makes use of a single LocalAuth instance.
Mostly a tidy up now that the refactor in #638

[ChesireBot]

	1 Warning
⚠️	Big PR

Generated by 🚫 Danger

[codecov]

Codecov Report

Merging #645 (92e9090) into master (76a4896) will decrease coverage by 0.68%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master     #645      +/-   ##
============================================
- Coverage     69.79%   69.11%   -0.69%     
+ Complexity      454      440      -14     
============================================
  Files           110      109       -1     
  Lines          1725     1677      -48     
  Branches        145      142       -3     
============================================
- Hits           1204     1159      -45     
+ Misses          477      475       -2     
+ Partials         44       43       -1     

Impacted Files	Coverage Δ
...nekome/datasource/auth/local/PreferenceProvider.kt	0.00% <0.00%> (ø)
.../chesire/nekome/datasource/auth/local/LocalAuth.kt	90.00% <90.00%> (ø)
...esire/nekome/datasource/auth/local/AuthProvider.kt	100.00% <100.00%> (ø)

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