Add Mod and refactor to smaller files

[marcduiker]

Next to adding Mod the dotnet bot, I also refactored quite a bit to avoid having very large files. I hope this will make future contributions for new pets (or names) a bit easier. I needed to more move than intended to avoid circular dependencies 😬.
If you don't want this as part of this PR let me know.

[codecov-commenter]

Codecov Report

Merging #296 (cbbaa8d) into master (ac75fc0) will increase coverage by 0.55%.
The diff coverage is 24.89%.

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
+ Coverage   14.52%   15.08%   +0.55%     
==========================================
  Files           7       17      +10     
  Lines        1005      696     -309     
  Branches      147       92      -55     
==========================================
- Hits          146      105      -41     
+ Misses        851      591     -260     
+ Partials        8        0       -8     

Impacted Files	Coverage Δ
src/common/types.ts	71.42% <ø> (ø)
src/panel/states.ts	16.56% <ø> (ø)
src/panel/basepettype.ts	2.87% <2.87%> (ø)
src/panel/pets/rocky.ts	37.50% <37.50%> (ø)
src/panel/pets/cat.ts	42.85% <42.85%> (ø)
src/panel/pets/clippy.ts	42.85% <42.85%> (ø)
src/panel/pets/cockatiel.ts	42.85% <42.85%> (ø)
src/panel/pets/crab.ts	42.85% <42.85%> (ø)
src/panel/pets/dog.ts	42.85% <42.85%> (ø)
src/panel/pets/mod.ts	42.85% <42.85%> (ø)
... and 10 more

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[tonybaloney]

Adjusted the English description of mod, so it says "Mod (the .NET bot)" in the dropdown to aid discoverability.

[tonybaloney]

Great contribution! Thanks Marc

[tonybaloney]