LLViewerWindow::handleKey(): Partial Fix for Issue 704: Keyboard shortcuts that should be passed to focused text fields are instead passed to selected prims when building

All edit keys now work, but Ctrl-A still doesn't work right, it must be grabbed by something else...
Adds LLFocusMgr::keyboardFocusHasAccelerators()
Adds virtual bool LLView::hasAccelerators() which returns false by default, overrides returning true placed in LLPreviewScript and LLPreviewNotecard
Shortcut keys added to notecard and script menu xmls

I'm thinking Qarl's Align tool handling may be receiving the Ctrl-A, we do seem to handle it differently than Exodus and Firestorm something modern could have broken the old way..
Come to think of it, those two features(Align and Select all prims) have a longstanding shortcut conflict in shortcuts... that's pretty nasty

indra/llui/llview.h

@@ -357,6 +357,11 @@ public:
 	BOOL focusNextRoot();
 	BOOL focusPrevRoot();
 
+	// Normally we want the app menus to get priority on accelerated keys
+	// However, sometimes we want to give specific views a first chance
+	// at handling them. (eg. the script editor)
+	virtual bool	hasAccelerators() const { return false; }
+
 	virtual void deleteAllChildren();
 
 	virtual void	setTentative(BOOL b);