Fixes to the quote feature. Most important changes listed below:
* FIX: Correctly attribute quotes when using Reply button
* FIX: Correctly attribute quotes when using replyAsNewTopic
* FIX: Allow quoting a quote
* FIX: Correctly mark quotes as "full"
* FIX: Don't try to create a quote if it's empty
* DEV: Remove an obsolete method `loadQuote`
It isn't used in core anymore, the only use in core has been removed over 4 years ago in 3251bcb. It's not used in any plugins in all-the-plugins and all references to it on GitHub are from outdated forks (https://github.com/search?q=%22Post.loadQuote%22&type=Code)
Adds keyboard bindings and associated help menu for selecting reminder type in bookmark modal, and pressing Enter to save.
Introduce the following APIs for `KeyboardShortcuts`:
* `pause` - Uses the provided array of combinations and unbinds them using `Mousetrap`.
* `unpause` - Uses the provided combinations and rebinds them to their default shortcuts listed in `KeyboardShortcuts`.
* `addBindings` - Adds the array of keyboard shortcut bindings and calls the provided callback when a binding is fired with Mousetrap.
* `unbind` - Takes an object literal of a binding map and unbinds all of them e.g. `{ enter: { handler: saveAndClose" } };`
