Start implementing "tool-panel" keymap scheme

Tool panels will be mapped to ctrl-# bindings. If the panel is focused, the # binding closes it. Otherwise the # binding shows it (if needed) and focuses it. The esc key unfocuses the panel, but does not necessarily close it. Meta-w always closes the panel.

This is the scheme. Right now we only have 2 panels:

Command Panel: Ctrl-0, esc still hides it
Tree View: Ctrl-1, esc just unfocuses it

src/extensions/tree-view/keymap.coffee

@@ -1,8 +1,11 @@
 window.keymap.bindKeys '#root-view'
-  'alt-tab': 'tree-view:focus'
+  'ctrl-1': 'tree-view:toggle'
   'ctrl-T': 'tree-view:toggle'
+  'alt-tab': 'tree-view:focus'
 
 window.keymap.bindKeys '.tree-view'
+  'escape': 'tree-view:unfocus'
+  'meta-w': 'tree-view:toggle'
   'right': 'tree-view:expand-directory'
   'left': 'tree-view:collapse-directory'
   'enter': 'tree-view:open-selected-entry'

src/extensions/tree-view/tree-view.coffee

@@ -49,6 +49,7 @@ class TreeView extends View
     @on 'tree-view:add', => @add()
     @on 'tree-view:remove', => @removeSelectedEntry()
     @on 'tree-view:directory-modified', => @selectActiveFile()
+    @on 'tree-view:unfocus', => @rootView.focus()
     @rootView.on 'tree-view:toggle', => @toggle()
     @rootView.on 'active-editor-path-change', => @selectActiveFile()
     @rootView.project.on 'path-change', => @updateRoot()
@@ -71,11 +72,11 @@ class TreeView extends View
     @root?.unwatchEntries()
 
   toggle: ->
-    if @hasParent()
+    if @is(':focus')
       @detach()
       @rootView.focus()
     else
-      @attach()
+      @attach() unless @hasParent()
       @focus()
 
   attach: ->