keyboard shortcuts for ribbon tabs

db/TODO.txt

@@ -3,3 +3,8 @@
 - isDeleted = 0 by default
 - rename openTabs to openNoteContexts
 - migrate black theme to dark theme
+- unify readOnly handling to a single attribute:
+  * readOnly - like now
+  * readOnly=auto - like without readOnly (used to override inherited readOnly)
+  * readOnly=never - like autoReadOnlyDisabled
+- remove focusOnAttributesKeyboardShortcut