Fix project settings

[wiruzx]

• Added IDETemplateMacros to Chatto and ChattoApp
• Added .DS_Store to .gitignore

[codecov-io]

Codecov Report

Merging #544 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
+ Coverage   63.51%   63.54%   +0.02%     
==========================================
  Files          76       76              
  Lines        3706     3706              
==========================================
+ Hits         2354     2355       +1     
+ Misses       1352     1351       -1

Impacted Files	Coverage Δ
...ws/TextMessageCollectionViewCellDefaultStyle.swift	89.87% <0%> (+1.26%)	⬆️

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