work on saving

Document and refactor colors.cpp and colors.h

Document model.h

Add documentation to model.cpp

Work on edit history

Merge commit

Add remaining serialize methods

Begin work on edit history

Begin work with serialization

add missing change to document.cpp

Add missing changes to canvas.h

Add documentation

Moved automatic grid adjusting into a new action

added a simple matrix transformation tool

moved ObjectEditor under SelectTool

Move tools under Document instead of MainWindow

esc with draw mode now clears the polygon

refactor

Show concave polygons as red while drawing

added right click support for draw tool

rework rendering of vertices

update

Add vertex rendering

Add vertex map

refactor

fix too long lines

added build-time test for line length

refactor

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