SettingsController: Refactor the appearance settings

This merge requests brings a change to the appearance settings:

• The appearance settings action sheet now displays the black background option when available, in order to group all the settings involved in the appearance of the application.
• The black background option is therefore removed from the Main section of the settings.

This merge request also brings a small adjustment in the name structure of the MediaPlayerActionSheetCellIdentifier.

Appearance_Settings

changed milestone to %3.5.0

added Interface Maintenance labels

added 3 commits

• 615358e4 - SettingsController: Refactor the appearance settings
• 14807915 - MediaPlayerActionSheet: Rename cell identifier enumeration
• a646cc57 - SettingsSection: Remove black background option from Main section

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merged