Variety of UI changes for grids, home page order, & tv guide (#272)

## Details
This PR ended up being larger than I meant. It contains some UI changes
and code organization.

## TV & DVR
- Uses the "Recordings" library position to order "Recently added in
Recordings" instead of Live TV position
- The times at the top of the TV guide are more distinguishable from
each other
- Removes the duplicate title on the Live TV->Recordings tab

## Other libraries
- Bare-bone support for "Music Video" libraries. Full support for "Music
Video" is work-in-progress in #267, but the libraries should be
browseable now.
- Bare-bone support for "Other" (aka Mixed Movies & TV Shows) libraries.
Note: this type of library is considered [broken and
deprecated](https://jellyfin.org/docs/general/server/media/mixed-movies-and-shows),
so this won't be expanded any further


## Grids
Updates various grid types to use poster vs wide cards. For example,
Favorite TV Episodes will use episode images in a wide card now.

## Issues
Closes #249 
Closes #271

app/src/main/java/com/github/damontecres/wholphin/util/Constants.kt

@@ -29,6 +29,9 @@ val supportedCollectionTypes =
         CollectionType.PLAYLISTS,
         CollectionType.BOXSETS,
         CollectionType.LIVETV,
+        CollectionType.MUSICVIDEOS,
+        CollectionType.FOLDERS,
+        null, // Mixed
     )
 
 val supportedPlayableTypes =