Make buttons unselectable

This improves copying and pasting quite a lot

css/glowingbear.css

@@ -478,6 +478,14 @@ li.buffer.indent.private a {
     font-size: small;
 }
 
+.unselectable {
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    -o-user-select: none;
+    user-select: none;
+}
+
 /* */
 /* Mobile layout */
 /* */

directives/input.html

@@ -3,7 +3,7 @@
     <textarea id="{{inputId}}" class="form-control favorite-font" ng-trim="false" rows="1" autocomplete="off" ng-model="command" ng-focus="hideSidebar()">
     </textarea>
     <span class="input-group-btn">
-      <button class="btn btn-default btn-primary">Send</button>
+      <button class="btn btn-default btn-primary unselectable">Send</button>
     </span>
   </div>
 </form>

directives/plugin.html

@@ -1,5 +1,5 @@
 <div ng-show="plugin.visible">
-  <button class="btn btn-primary btn-sm pull-right"
+  <button class="btn btn-primary btn-sm pull-right unselectable"
           ng-click="hideContent()">
     Hide {{ ::plugin.name }}
   </button>
@@ -8,7 +8,7 @@
 </div>
 
 <div ng-hide="plugin.visible">
-  <button class="btn btn-sm pull-right"
+  <button class="btn btn-sm pull-right unselectable"
           ng-class="::{
                     'btn-warning': plugin.nsfw,
                     'btn-primary': !plugin.nsfw}"