Implement 'with' statement #104

[flexferrum]

No description provided.

[codecov-io]

Codecov Report

Merging #110 into master will increase coverage by 0.1%.
The diff coverage is 97.14%.

@@            Coverage Diff            @@
##           master     #110     +/-   ##
=========================================
+ Coverage   87.15%   87.25%   +0.1%     
=========================================
  Files          54       54             
  Lines        6133     6198     +65     
=========================================
+ Hits         5345     5408     +63     
- Misses        788      790      +2

Impacted Files	Coverage Δ
src/lexer.h	86.3% <ø> (ø)	⬆️
src/template_parser.h	89.97% <ø> (ø)	⬆️
test/errors_test.cpp	100% <100%> (ø)	⬆️
src/statements.cpp	93.54% <100%> (+0.13%)	⬆️
test/set_test.cpp	100% <100%> (ø)	⬆️
src/statements.h	85.1% <85.71%> (-0.13%)	⬇️
src/template_parser.cpp	94.49% <97.5%> (+0.24%)	⬆️

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