Viewbox refactor

[artemp]

re-factor viewport/viewBox logic to support nested <svg> elements

[codecov[bot]]

Codecov Report

Base: 75.00% // Head: 74.94% // Decreases project coverage by -0.07% :warning:

Coverage data is based on head (9e96740) compared to base (4e064b8). Patch coverage: 37.20% of modified lines in pull request are covered.

:exclamation: Current head 9e96740 differs from pull request most recent head d02f6e4. Consider uploading reports for the commit d02f6e4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4373      +/-   ##
==========================================
- Coverage   75.00%   74.94%   -0.07%     
==========================================
  Files         524      511      -13     
  Lines       36774    36709      -65     
==========================================
- Hits        27582    27511      -71     
- Misses       9192     9198       +6     

Impacted Files	Coverage Δ
include/mapnik/svg/svg_parser.hpp	100.00% <ø> (ø)
...nclude/mapnik/svg/svg_transform_grammar_x3_def.hpp	19.29% <11.11%> (ø)
src/svg/svg_parser.cpp	80.58% <44.11%> (+0.15%)	:arrow_up:
src/datasource_cache_static.cpp	33.33% <0.00%> (-60.96%)	:arrow_down:
plugins/input/pgraster/pgraster_datasource.hpp	0.00% <0.00%> (-50.00%)	:arrow_down:
include/mapnik/expression_evaluator.hpp	54.32% <0.00%> (-28.38%)	:arrow_down:
include/mapnik/debug.hpp	71.01% <0.00%> (-26.82%)	:arrow_down:
include/mapnik/webp_io.hpp	44.21% <0.00%> (-17.56%)	:arrow_down:
src/tiff_reader.cpp	56.25% <0.00%> (-1.75%)	:arrow_down:
plugins/input/geobuf/geobuf_datasource.cpp	68.86% <0.00%> (-0.86%)	:arrow_down:
... and 53 more

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