This commit refactors the way `InfoItemDialog`s are generated. This is necessary because the old way used the `StreamDialogEntry` enum for most of the dialogs' content generation process. This required static variables and methods to store the entries which are used for the dialog to be build (See e.g.`enabledEntries` and methods like `generateCommands()`). In other words, `StreamDialogEntry` wasn't an enumeration anymore.
To address this issue, a `Builder` is introduced for the `InfoItemDialog`'s genration. The builder also comes with some default entries and and a specific order. Both can be used, but are not enforced.
A second problem that introduced a structure which was atypical for an enumeration was the usage of non-final attributes within `StreamDialogEntry` instances. These were needed, because the default actions needed to overriden in some cases.
To address this problem, the `StreamDialogEntry` enumeration was renamed to `StreamDialogDefaultEntry` and a new `StreamDialogEntry` class is used instead.
Prefering video-only streams to video streams for our player will allow us to make seamless transitions on 360 and 720p qualities on YouTube.
External players and the downloader are not affected by this change.
The previous/reverted behavior caused unwanted data transmission:
* Removed loading via handleResults/loadMoreItems-callback because the RecyclerView is apparently not immediately updated in the UI when the data is set which causes one load of data to much.
* Always recreate the footer so that it's not possible to attach the same instance twice
* Removed support for creating a custom footer as it's never used
* Supply the header with an supplier
* This might not fix the problem completely as we currently can only create the header once inside Channel, Playlist and RelatedItems-Fragment - allowing creation of multiple headers might be done in the future if the issues still arise
* Other minor fixes
The workaround set before was not applied when switching to main player with content thumbnail from popup or background player. This commit fixes this by applying the workaround when switching to main player with content thumbnail from popup or background player.
Add annotations to methods and parameters.
Replace Jetbrains' @NotNull with Androidx' @NonNull annotatiation.
Make class variables static if possible.
Use constants for some Strings.
Simplify if conditions.
