Renamed some methods of the Model class to remove the 'emplace' word (however cromulent it is, being from STL...) from them.

Moved LDObject lifetime management from Model to ResourceVector. This is a large refactor that removes some hacks from the Model class.

Added a new type ResourceVector which manages object lifetimes, and used it to remove a bit of memory management.

Polar grid is now togglable.

CMake fixes

Added polar grid snapping code.

Added polar grid rendering (which is disabled for now).

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