Diffing assumes that all tags are removed and then re-added. This makes
it easier to resolve at the cost of a larger performance impact. This
should be negligible since container should not have many tags at any
given point in time.

Implement window quickfix method. Allow users to send tags to a quickfix
list.

Window must know as little as possible about Content. The same goes for keymaps.
However, there are actions available (i.e. tag selection) that must know about
both the vim buffer and vim window. The revised models are as follows:

The Window can render at most one Content at a time
The Window can #attach or #detach from Content
The Window can #update and #render Content

The Content does not hold state for any vim constructs and must receive them from Window
The Content uses #update to update internal state
The Content uses #render to publish its state to a vim buffer
The Content uses #attach to call hooks
The Content uses #detach to reconcile modified entries

A Content hook will receive a window for access to ui information
A Content hook will receive a window to create keymaps or autocommands
A Content hook will receive the content itself to perform actions

…tent title

…e manager

…_branch

This allows (in the future) for actions to open their own floating window without closing the grapple window

…d backward

Replaced by the path module

…g code

…ontent id

Add basic scope window. Will be used to select the default scope. Right now it only shows the scope's name and (new) description.

Also, renamed some classes. The "." style wasn't quite working out.

Also, fix off-by-one error in Grapple.cycle

…ndow section

fix: TagActions opts might not always exist
fix: Parse empty values passed into Grapple as nil
fix: Use correct set of arguments when calling via Grapple command
refactor: TagContainer now accepts grapple.options rather than specialized args per method
refactor: TagContainer.insert will insert or replace based on path
refactor: Add fast lookup for tags based on path and name (unique)
refactor: Create Path.fs_absolute and Path.fs_relative for when needing to observe the filesystem