Allow rectangle drawing by pressing shift when inserting the first vertex.

Made drawing an edit mode, allowing me to add more modes in the future

Added icons for Isecalc and coordinate replacer

Added Isecalc interface

Added icon for drawing

Added Coverer interface

Un-templated CheckBoxGroup, moved it and RadioButton into widgets.cpp/widgets.h; removed license text tab because I think LICENSE is enough.

Added icons for wireframe and inversion

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mercurial