GRL - camera facing

[RolandCsibrei]

TODOs:

• Create base mesh class for camera facing and non camera facing greased line meshes
• Widths in instance modes
• Calculate correct UVs for non camera facing meshes
• Do not join ribbon paths in path_mode
• Set default values for the options, same as for the camera facing GRL
• Calculate slopes faster
• Widths in instance mode and different point modes
• Color tables in instance mode and different point modes
• Clone
• Serialize
• Parse
• Doublesided
• Closed paths
• Lazy mode
• Check UVs
• Offsets
• Add face modes in options (single, doublesided, single no culling). Remove doubleSided option.
• Check color pointers / move to base mesh
• Share color textures
• Calculate directions in points mode points if no direction is specified. Don't use default direction. Add auto calc modes.
• Visualization tests

OPTIMALIZATIONS:

• Don't use ribbon builder class for building the mesh but create it manually in a more optimal way

[bjsplat]

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[bjsplat]

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[RolandCsibrei]

@Popov72 Hi! Ready for re-review. Thank you!

[Popov72]

Almost there!

[RolandCsibrei]

@Popov72 I've modified the MeshesToLines tool function's predicate and added a new one while waiting for @sebavan