CIF-1625 Setup dev branch with snapshot dependencies

[herzog31]

Description

• Added CIF Core components to build on all branches except main. By default the master branch is used. If there exists a branch with the same name, it will be checked out instead.
• Fixed codecov.yml and ignore coverage of all dependencies.
• Explained branching strategy in README.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #55 into dev will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev      #55   +/-   ##
=========================================
  Coverage     79.16%   79.16%           
  Complexity       13       13           
=========================================
  Files             1        1           
  Lines            24       24           
  Branches          4        4           
=========================================
  Hits             19       19           
  Misses            3        3           
  Partials          2        2           

Flag	Coverage Δ	Complexity Δ
#unittests	79.16% <ø> (ø)	13.00 <ø> (ø)

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[mhaack]

This has been verified and is already used by the #54 PR