Project structure refactoring

[sp1thas]

This PR aims to refactor the project in order to:

1. Split dropbox ignore into multiple separate shell scripts.
2. Split tests into multiple .bats files.

[codecov-commenter]

Codecov Report

Base: 85.40% // Head: 85.65% // Increases project coverage by +0.24% 🎉

Coverage data is based on head (aa01c67) compared to base (639eb34).
Patch coverage: 85.65% of modified lines in pull request are covered.

❗ Current head aa01c67 differs from pull request most recent head c712efb. Consider uploading reports for the commit c712efb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   85.40%   85.65%   +0.24%     
==========================================
  Files           1       17      +16     
  Lines         233      251      +18     
==========================================
+ Hits          199      215      +16     
- Misses         34       36       +2     

Impacted Files	Coverage Δ
src/lib/modules/utils.sh	68.42% <68.42%> (ø)
src/lib/commands/revert.sh	68.75% <68.75%> (ø)
src/lib/modules/ignore.sh	71.42% <71.42%> (ø)
src/lib/modules/revert.sh	71.42% <71.42%> (ø)
src/lib/commands/list.sh	73.33% <73.33%> (ø)
src/lib/commands/ignore.sh	80.76% <80.76%> (ø)
src/lib/commands/delete.sh	92.30% <92.30%> (ø)
src/lib/modules/base.sh	94.11% <94.11%> (ø)
src/bin/cli.sh	96.42% <96.42%> (ø)
src/lib/commands/generate.sh	100.00% <100.00%> (ø)
... and 7 more

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