minor cleanup

Renamed "quick colors" in the configuration to "color toolbar"

- re-added the external programs to the toolbar

updated README.md with a mention of the ring drawing

minor cleanup

- added build_shared to .gitignore

- Improved coordinate rounding, replaced the hack with a proper implementation, now rounds properly and works on subfiles as well

- Renamed common.h to main.h, split the PROPERTY macro and supporting macros to property.h

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