add handling of includes

[joergbuchwald]

fixes #10

• project files with includes can be read and altered
• method added to replace a block by an include
• TODO: add_include() should be shifted as it is not a replace method

[codecov[bot]]

Codecov Report

Merging #16 (5cab843) into master (112e74e) will increase coverage by 2.19%. The diff coverage is 64.47%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   61.81%   64.01%   +2.19%     
==========================================
  Files          18       18              
  Lines        1066     1106      +40     
==========================================
+ Hits          659      708      +49     
+ Misses        407      398       -9     

Impacted Files	Coverage Δ
ogs6py/ogs.py	75.62% <64.47%> (+6.69%)	:arrow_up:

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