Have uniform behavior to dismiss windows with `Esc` key

[IvenBach]

Justification It's habit for me to use the hotkey Esc to dismiss as title states. Some windows are dismissable while others aren't. Unify the UX with respect to the UI windows.

Description

• If a window is not docked, IE free-floating, and has focus it should be dismissable with Esc.
• Free-floating and doesn't have focus Esc shouldn't dismiss it.
• When docked Esc shouldn't dismiss, It should remain docked.

Additional context Dismissable via Esc:

• Settings
• Add/Remove references
• Regex Assistant
• Export Active Project
• Find Symbol
• Rename

Non-Dismissable via Esc

• Code Inspections
• ToDo Explorer
• Code Metrics
• Code Explorer
• Search Results (should dismiss active sub-tabs, ultimately dismissing window when last tab dismissed)
• Encapsulate Field
• Test Explorer

[Vogel612]

IIUC the windows you noted as dismissable are explicitly intended as Dialog windows. The others are mostly dockable toolwindows which should not be dismissable, (because they are not dialogs). Encapsulate Field and Search Results are probably better off as dialog windows, though.