+ some are doxy others are just comment code.
+ some minor whitespace and grammatical tweaks.
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.
A new symbol command and Drawing::FeatureViewSymbol object allow to
load the contents of an external svg file and place it as a symbol
on a Drawing page. This symbol can then be moved and rescaled.
