New interior for v3.0.x

[talaj]

Addresses #3839.

[codecov]

Codecov Report

Merging #3840 into v3.0.x will increase coverage by 6.94%.
The diff coverage is 96.42%.

@@            Coverage Diff             @@
##           v3.0.x    #3840      +/-   ##
==========================================
+ Coverage   58.34%   65.28%   +6.94%     
==========================================
  Files         435      443       +8     
  Lines       21654    21813     +159     
  Branches     3200        0    -3200     
==========================================
+ Hits        12634    14241    +1607     
+ Misses       7607     7572      -35     
+ Partials     1413        0    -1413

Impacted Files	Coverage Δ
include/mapnik/markers_placements/basic.hpp	100% <ø> (ø)	⬆️
include/mapnik/geom_util.hpp	87.5% <ø> (+87.5%)	⬆️
...apnik/renderer_common/process_point_symbolizer.hpp	88.09% <0%> (+13.09%)	⬆️
src/text/symbolizer_helpers.cpp	95.93% <100%> (+11.64%)	⬆️
...clude/mapnik/geometry/polygon_vertex_processor.hpp	100% <100%> (ø)
src/renderer_common/render_markers_symbolizer.cpp	96.29% <100%> (+8.44%)	⬆️
include/mapnik/markers_placements/interior.hpp	78.26% <100%> (+37.08%)	⬆️
src/geometry/interior.cpp	96.1% <96.1%> (ø)
include/mapnik/raster_colorizer.hpp	85.71% <0%> (-14.29%)	⬇️
include/mapnik/text/scrptrun.hpp	90% <0%> (-4.74%)	⬇️
... and 195 more

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[artemp]

Thanks @talaj !