Update Camera presets

The (tracking) camera presets have not been updated in the last 7 or
more years, so they are very outdated. I found it pointless to have a
few specific camera models in the list and instead add the most commonly
used sensor sizes/film sizes. This way the list is shorter, easier to
maintain/becomes later outdated, and is more user friendly for most people
who don't own any of the specific cameras. I added the Crop Factor to the
Beginning of the name, so it gets sortet in the correct order and presets
are easier to find based on the size.

Reviewed By: #render_cycles, #motion_tracking, brecht, sergey

Differential Revision: https://developer.blender.org/D10739

release/scripts/modules/bpy/path.py

@@ -198,6 +198,7 @@ def _clean_utf8(name):
 _display_name_literals = {
     ":": "_colon_",
     "+": "_plus_",
+    "/": "_slash_",
 }