Remove old UIView extensions for auto-layout constraints 📐

[filipe-lemos]

Checklist

• I've rebased my changes on top of master
• I've built and run the project to see all new and existing tests pass
• I've followed the Mindera swift style guide
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Alicerce has two types of auto-layout constraint helpers, these old
ones defined as extensions on UIView and also a newer, more powerful,
approach on the 'Auto-Layout' module.

Removing the old approach should avoid confusions and simplify the code
provided through Alicerce.

Description

• Remove old UIView extensions for auto-layout constraints (and associated unit tests)

[codecov]

Codecov Report

Merging #237 (36d459d) into master (af7a9bc) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage   94.99%   94.94%   -0.05%     
==========================================
  Files          97       96       -1     
  Lines        3296     3264      -32     
==========================================
- Hits         3131     3099      -32     
  Misses        165      165              

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[p4checo]

🚀