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

- Changed the callback parm of PROPERTY to a stock/custom write method argument.

- upgraded the PROPERTY macro, resulting in a major code refactor

- ensured header files' guards start with LDFORGE_

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