Add keybind, default state option to toggleable watcher

Addresses #956 by adding a keybind to toggle visibility of thread
watcher rather than simply the header bar icon. Also adds an option in
config for the watcher to default to visible or not.

src/Miscellaneous/Keybinds.coffee

@@ -97,6 +97,9 @@ Keybinds =
       when Conf['Update thread watcher']
         return unless ThreadWatcher.enabled
         ThreadWatcher.buttonFetchAll()
+      when Conf['Toggle thread watcher']
+        return unless ThreadWatcher.enabled and Conf['Toggleable Thread Watcher']
+        ThreadWatcher.toggleWatcher()
       # Images
       when Conf['Expand image']
         return unless ImageExpand.enabled and threadRoot

src/Monitoring/ThreadWatcher.coffee

@@ -35,7 +35,8 @@ ThreadWatcher =
     if Conf['Fixed Thread Watcher']
       $.addClass doc, 'fixed-watcher'
     if Conf['Toggleable Thread Watcher']
-      @dialog.hidden = true
+      if !Conf['Watcher Defaults to Visible']
+        @dialog.hidden = true
       Header.addShortcut 'watcher', sc, 510
       $.addClass doc, 'toggleable-watcher'
 

src/config/Config.coffee

@@ -389,6 +389,11 @@ Config =
         'Adds a shortcut for the thread watcher and hides the watcher by default.'
         1
       ]
+      'Watcher Defaults to Visible': [
+        false
+        'Displays the thread watcher by default, rather than hiding it.'
+        2
+      ]
       'Mark New IPs': [
         false
         'Label each post from a new IP with the thread\'s current IP count.'
@@ -857,6 +862,10 @@ Config =
       'Shift+r'
       'Manually refresh thread watcher.'
     ]
+    'Toggle thread watcher': [
+      't'
+      'Toggle visibility of thread watcher when toggle is enabled'
+    ]
     # Images
     'Expand image': [
       'Shift+e'