Preset operators should avoid using `bpy.context.object.data` as a base
path to properties. This path is not available in the buttons context
when using pinned datablocks! Instead use the specific
`bpy.context.camera` and `bpy.context.lamp.sky` paths now, which lead to
the correct datablocks in any case.
* Switch to using Canon sensor type instead of camera models.
There are a ton of camera models that reuse the same sensor
so it's just confusing and forever incomplete to try and cover
all models.
* Delete all redundant Canon camera models..
* Leave only the Canon camera models that are special, that is
have non regular sensor sizes.
* Fix a few errors in some Canon models.
* Capitalize a few unrelated sensor presets for consistency.
* Added presets for GoPro and iPhone.
Their distortion models and shutter isn't really supported ATM
but tracker is robust enough to give reasonable tracking and
solving results.
Presets are from Daniel Salazar and Sebastian Koenig, thanks!
Differential Revision: https://developer.blender.org/D264
