RichCommand: Glyph + ContextMenu + EmptyRecycleBinAction

[cinqmilleans]

Resolved / Related Issues

• Usage of glyphs in IAction. This simplifies the use of icons with the FontIcon and ColoredIcon properties of IRichCommand.
• Simplifies the creation of context menus. It is possible to pass a RichCommand to ContextMenuFlyoutItemViewModel to initialize it.
• Added RichCommand EmptyRecycleBin, which uses glyphs. This command is used everywhere, including the sidebar. Old commands are deleted. This new action does not yet use the IsExecutable property. This requires the context class and will be the subject of a future pr.
• A behavior has changed slightly. In the context menu of the RecycleBin page, the RecycleBin command is no longer active if the RecycleBin is empty. This seemed like a bug to me.
• A bug has been fixed in the parser of HotKey (not yet used).
• The next step is to add the context. This is the last part of the command base. Then, it will be necessary to convert the current commands (actions + use in the views).

Validation
How did you test these changes?

• Built and ran the app
• Tested the changes for accessibility

[yaira2]

Can you add support for OpacityIcon? We're currently only using them in the toolbar but we're going to want to use them in the context menu as well.

[cinqmilleans]

I haven't looked at this class but probably it's possible. I will watch for the next iteration.

[yaira2]

@cinqmilleans please fill out validation steps and add any other steps you used. This helps us know what to test for when reviewing the PR.

[yaira2]

LGTM