Modernize project

[ctreffs]

Description

• Adds Mint as dependency manager for project tools
• Update Makefile
• Lint and format code
• Set realm/SwiftLint to 0.57.0
• Set nicklockwood/SwiftFormat to 0.54.6
• Set krzysztofzablocki/Sourcery to 2.2.5

Checklist

• I've read the Contribution Guidelines
• I've followed the coding style of the rest of the project.
• I've added tests covering all new code paths my change adds to the project (to the extent possible).
• I've added benchmarks covering new functionality (if appropriate).
• I've verified that my change does not break any existing tests or introduce unexpected benchmark regressions.
• I've updated the documentation (if appropriate).

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.91%. Comparing base (a5c98c4) to head (e047441).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   96.92%   96.91%   -0.01%     
==========================================
  Files          24       24              
  Lines        1072     1069       -3     
==========================================
- Hits         1039     1036       -3     
  Misses         33       33