Replenish optics options

There was a significant reduction in optics options during the v7 tidy up. We need to reinstate some options but be clearer that they are not the core supported options. Due to the reconfigured optics module certain changes are now very easy (using a different tube lens for instance).

Things that we should look into:

• Make sure the dashcam works in v7 and add instructions
• Make optics options for using a webcam
• Support 35mm parfocal objectives (using a different optics module)

Optics options that are not built that need some testing

Some optics options have been removed from build.py

Options that have been removed from CAMERAS:

• logitech_c270 - can be reinstated if it can be made compatible with all options, or edit build script so only compatible options are created.

Lenses that are never used to generate lens spacers, as compatible spacers don't exist:

• c270_lens
• m12_lens
• dashcam_lens
• 6ledcam_lens