RGB30 improvements + theme color XML refactoring + video/detailed view differentiation

[taoquay]

This PR started out as a few layout fixes for overlapping text in the metadata of the detailed/video views I noticed on the RGB30, but while working on it, I implemented more changes along the way. Here is a list of changes:

1. In video/detailed view, the metadata values were overlapping with the labels by a few pixels. I created a separate RGB30 detailed view style, since I didn't want to impact existing devices that don't have a 1:1 display. With the additional vertical space of the RGB30, I added the "last played" field, since there was enough space for it.
2. Most of the theme color XML files are very similar, with a lot of duplicated code. I refactored it by moving the common code directly to themes.xml. This change makes it much easier to change the format of the release date, as we no longer need to modify the %Y line in each of the 20 color themes, and can do it only once from themes.xml.
3. The video and detailed views appear to be identical in function. I made the detailed view different by disabling the video playback, so it only displays the 2D box art. With this change, there is an actual distinction between the video and detailed views.

I did some regression testing to check that I didn't break anything with the refactoring of the XML from the changes and everything looks to be OK to me.

I'm open to discuss or apply changes to the PR if need be. In particular, as I only have a RGB30, I don't know if the overlapping text with the metadata is specific to the RGB30, or if other devices with 4:3, 3:2 or 16:9 aspect ratios also have the problem. I can apply the fix to the regular withmeta.xml file, if the overlapping text issue is not specific to the RGB30.