fix: Bookmark comment shortcuts (issue #2055)

[paxcut]

Fixes for #2055.

Added the registrations for the editor shortcuts and reorganized the registration calls into events and handlers.

Needed a way to select which of the possibly multiple editors sees the effects of the keyboard so a pointer to the current text editor in use was added to the view bookmarks class. The pointer may be empty so the shortcuts need to check it before using it.

To detect which of the editors needs to see the effects of the shortcuts a function ws added to text editor that tells if window has focus.

To avoid errors when editors become read only, asserts were exchanged with do-nothing early returns on the text editor.

To avoid using the default language coloring (HLSL), the colorize enabling variable was set to false.

A suggestion by cppcheck simplified the logic of a conditional on view bookmarks.

On view pattern editor some icons were added to console menu entries.

[WerWolv]

I don't think duplicating these shortcut definitions everywhere where the text editor is used is a good idea... Maybe it would make sense to add a new helper class to the ui plugin that just wraps the Text Editor with the things we need and adds the shortcuts there. That way we can just use that new class everywhere and have the shortcuts work and affect the currently focused editor