Fix cubemap & video clip reporting

[projects-rr]

Cubemaps & video clips do not currently have their size properly reported.

• Add Cubemaps to the existing texture data, along with the 'ImageCount' field. Note, the files for this are called Texture2D*, but the databases are texture*, so they seem like the proper place to put all texture types. This code should potentially get updated for other texture types (Texture3D, Texture2DArray, etc...) however I don't have example content to test this with right now.

• Add video clips to their own database & view

[SkowronskiAndrew]

Thanks for the submission, and sorry for long delay in responding it. The underlying code for adding new types has evolved a bit but adding a table for Video objects makes sense and would be pretty low risk. However it will take a bit of testing and ideally adding a example file with a tiny video inside it for automated test coverage.

I don't know enough about the ins and outs of Textures and how they are serialized to judge if there could be any special concern with adding the image count column.