Remove Dispatcher.swift

[mmatoszko]

This PR removes Dispatcher.swift 🎉
This ended up bigger than I expected 😅
Please let me know if the change is too big. I think we can easily split it up into smaller pieces.

[codecov-io]

Codecov Report

Merging #350 into master will increase coverage by 0.15%.
The diff coverage is 35.71%.

@@            Coverage Diff            @@
##           master    #350      +/-   ##
=========================================
+ Coverage   44.15%   44.3%   +0.15%     
=========================================
  Files          31      30       -1     
  Lines        3889    3860      -29     
=========================================
- Hits         1717    1710       -7     
+ Misses       2172    2150      -22

Impacted Files	Coverage Δ
Sources/XiEditor/RPCSending.swift	58.08% <ø> (+1.1%)	⬆️
Sources/XiEditor/EditViewController.swift	27.41% <0%> (ø)	⬆️
Tests/XiEditorTests/XiCoreTests.swift	94.31% <0%> (-4.5%)	⬇️
Sources/XiEditor/AppDelegate.swift	36.76% <100%> (-1.05%)	⬇️
Sources/XiEditor/XiCore.swift	94.59% <33.33%> (-5.41%)	⬇️
Sources/XiEditor/Document.swift	56.07% <33.33%> (-0.41%)	⬇️

---

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 3d96c2d...77e07be. Read the comment docs.

[cmyr]

Looks good. Does this close #341?

[mmatoszko]

Did you mean #275 ?
I think so, yes 👍

[cmyr]

Thanks, feels great to have this cleaned up!