Rename Pi to lowercase pi

Renamed ldObjectMath.cpp/.h to mathfunctions.cpp/.h

Moved rotation point handling to ldObjectMath.cpp and encapsulated it into new class MathFunctions

Split grid stuff into a new class Grid in grid.cpp/grid.h

Use a better gcd algorithm, some style fixes

Replaced GetRecursiveFilenames with QDirIterator

Reformatted primitives.cpp

Split PrimitivePrompt into its new source files, renamed it to GeneratePrimitivePrompt

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