Python API

[GPMueller]

• added the option to use a clang-build.py project configuration script, which should provide a function get_project(directory, environment, parent=None) -> clang_build.project.Project
• the initialization of Project and TargetDescription is changed to allow more intuitive usage in a clang-build.py project configuration script
• Project and TargetDescription now have get_sources functions, which can be overridden to change the way in which sources are obtained. This allows for example to generate sources such as a header with git-supplied version information
• added tests for the new functionality

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• closes #87
• closes #90

[codecov[bot]]

Codecov Report

Merging #110 into master will decrease coverage by 0.52%. The diff coverage is 83.39%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   80.47%   79.94%   -0.53%     
==========================================
  Files          16       17       +1     
  Lines        1168     1192      +24     
==========================================
+ Hits          940      953      +13     
- Misses        228      239      +11     

Impacted Files	Coverage Δ
clang_build/errors.py	75.00% <ø> (ø)
clang_build/single_source.py	66.66% <ø> (+3.58%)	:arrow_up:
clang_build/git_tools.py	49.12% <61.90%> (+5.12%)	:arrow_up:
clang_build/environment.py	73.41% <73.41%> (ø)
clang_build/clang_build.py	51.51% <83.33%> (-8.83%)	:arrow_down:
clang_build/target.py	80.06% <85.00%> (-1.76%)	:arrow_down:
clang_build/project.py	85.76% <93.04%> (-3.02%)	:arrow_down:
clang_build/flags.py	100.00% <100.00%> (ø)
... and 1 more

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[NOhs]

Ok, seems my comments are gone because I pressed the wrong button. I will start again :(.