Shortcut activations should have their own presenter based in key catcher

[hernanmd]

Now we are using a text presenter in CmdShortcutActivation>>#asSettingPresenter:.

For instance:

settingInputWidgetForNode: aShortcutSetting
	| catcherMorph theme |
	theme := UITheme builder.
	
	catcherMorph := KMCatcherMorph for: aShortcutSetting.
	^ theme newRow: {catcherMorph}