Add CMake Interface, autogen CMake docs

[AutonomicPerfectionist]

This pull request adds a cmake interface to CMinx, allowing easy documentation generation during the configure and build stages. An example of this is seen in CMakeLists.txt, where we now autogen CMake RST docs during the configure phase and add a build target to build docs, accessible in the build phase.

[codecov[bot]]

Codecov Report

Merging #28 (6533206) into master (09701b0) will decrease coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   86.97%   86.90%   -0.08%     
==========================================
  Files           8        8              
  Lines         860      863       +3     
==========================================
+ Hits          748      750       +2     
- Misses        112      113       +1     

Impacted Files	Coverage Δ
cminx/__init__.py	89.70% <100.00%> (+0.15%)	:arrow_up:
cminx/parser/CMakeParser.py	68.69% <0.00%> (-0.32%)	:arrow_down:
cminx/parser/aggregator.py	100.00% <0.00%> (ø)
cminx/rstwriter.py	98.20% <0.00%> (+<0.01%)	:arrow_up:

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[ryanmrichard]

Is this ready to merge then?

[AutonomicPerfectionist]

Yes, it should be ready to merge now.