Texmap Implementation

[cuddlyogre]

Implement planar, cylindrical, and spherical texmap projection.

The method that ldraw uses for textures is different that the one that stud.io uses, which will cause missing textures when viewing your part in anything but stud.io. LDraw used projection of image files on your disk to display textures, where stud.io textures are base64 encoded PNGs stored in the file itself.

TobyLobster/ImportLDraw#64

[cuddlyogre]

Official texmap support is being implemented, thanks to
https://github.com/trevorsandy/lpub3d/blob/e7c39cd3df518cf16521dc2c057a9f125cc3b5c3/lclib/common/lc_meshloader.cpp#L1486
https://github.com/trevorsandy/lpub3d/blob/e7c39cd3df518cf16521dc2c057a9f125cc3b5c3/lclib/common/lc_meshloader.cpp#L12

[cuddlyogre]

TobyLobster/ImportLDraw#9