Create a first version of an SPM package that contains feature detection and attribute calculation parts of the app

[himanshunaidu]

This will help assess the feasibility of using Swift packages for reusing code between AVIV ScoutRoute and iOSPointMapper.

Complications seem to be present w.r.t Metal files (especially incorporating the globally used ShaderTypes.h into Metal), Machine Learning models (probably need to be pre-compiled), and C and C++ files (currently used to code png files).

However, even if the SPM package is not successfully created, the modularization can help in a more seamless integration of any kind.