[iOS] Media Item Menu | Edit Metadata

[JPKribs]

Summary

Adds a section to the ItemEditorView to allow for manually changing most metadata. This does not include free-form content such as:

• Studios
• Genres
• People
• Tags

These will be added in a later PR to keep this from getting too large. These will require an editView & addView to allow deleting existing items or adding a new item to them. To simplify review, these can be seen here but I'll add these as a separate component when ready.

Screenshots

New Button

View pt. 1

View pt. 2

View pt. 3

[JPKribs]

This is still coming in a little bigger than I would like it to but a lot of the line count is coming from the enums/extensions that are more volume than substance. I'm leaving this in draft for a sec because I'm under the weather this week and want to review this more in depth with a clear head. Primarily I want to look at:

1. Should Metadata & Lock Metadata Sections be two separate views?
2. Does splitting the Pickers into their own files make sense? It makes sense for Language since I can see use reusing that for something like 'Default subtitles' or a feature like that later but I doubt Country will get much use. Finally, I would be amazed if 3DVideoFormatPicker ever gets usages outside this PR.
3. Does the order of the sections/buttons make sense?
4. Is the current switch case for EditMetadataView the best way to do this between ItemTypes or is there a better way to be doing this?