UI: Reorganize Preview/Source context menu

[Warchamp7]

Description

Reorganizes the order of menu items in the Preview and Source right-click context menus. On top of adjustments to menu entry order, functional changes are:

• Copy filters / Paste filters only shown in the sources dock menu and only when a source is selected
• Copy only shown when a source is selected
• Set Color removed from preview menus
• Hide in Mixer removed from preview menus
• Projector menus are now all a single submenu instead of a fullscreen submenu and a separate windowed entry

Motivation and Context

A lot of entries in the preview context menu have been added over time and their order and position are only loosely tied together.

While there is no perfect ordering or grouping here due to overlapping contexts and functionality. This reorganizes the menu to be a bit more thoughtful.

Preview (No source selected)

Before	After

Sources dock (No source selected)

Before	After

Preview (Source selected)

Before	After

Sources dock (Source selected)

Before	After

How Has This Been Tested?

Checked all the menu options still behaved as expected.

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.