symbolizer properties default values
update get<>() to use values from symbolizer_default_values.hpp
fix names + update property_meta_type tuple
re-implement assign_value to use target property type
upgrade to new get<value_type, keys::key>
remove cast
default to GLOBAL alignment
fix test - previous image was actually being rendered with radial-distance
simplify readme
ignore scale_factor for geometry-transform scale
add visual test - geometry-transform scale