remove expression log base from explicit inialization
add a paranoid check to make sure all colors are hex strings, not rgb tuples
always convert rgb tuples to strings
Merge branch 'feature/always_convert_rgb_colors_to_hex' into dev

* feature/always_convert_rgb_colors_to_hex:
  always convert rgb tuples to strings
  add a paranoid check to make sure all colors are hex strings, not rgb tuples
Merge branch 'feature/expression_log_base_inconsistencies' into dev

* feature/expression_log_base_inconsistencies:
  remove expression log base from explicit inialization