Feature #44: Image capture WebRTC & HTML5 FileIO

Silverlight was previously used to capture webcam pictures and upload
file attachments. HTML5 FileIO is now used for all attachment uploading
- including drag-drop support. WebRTC is used to capture webcam images -
this falls back to a Flash polyfill when WebRTC isn't supported.

Disco.Web/ClientSource/Style/User.less

@@ -206,12 +206,17 @@
 
 
 #userShowResources {
-    #Attachments {
+    #AttachmentsContainer {
         padding: 0;
+    }
+
+    #Attachments {
+        position: relative;
         border: 1px solid @SubtleBorderColour;
         background-color: @white;
 
         div.attachmentOutput {
+            position: relative;
             height: 115px;
             overflow: auto;
             font-size: 0.95em;
@@ -256,6 +261,10 @@
                     img {
                         height: 48px;
                         width: 48px;
+
+                        &.loading {
+                            display: none;
+                        }
                     }
                 }
 
@@ -272,8 +281,7 @@
                     cursor: pointer;
                     opacity: 0;
 
-                    &:hover
-                    {
+                    &:hover {
                         opacity: 1;
                     }
                 }
@@ -290,8 +298,7 @@
             background-color: @white;
             padding: 3px;
 
-            span.action
-            {
+            span.action {
                 color: @HeaderBackgroundColour;
                 display: block;
                 margin: 0 4px 0 0;
@@ -301,8 +308,7 @@
                 border: 1px solid @white;
                 padding: .5em;
 
-                &:hover
-                {
+                &:hover {
                     color: @HyperLinkColour;
                     background-color: @SubtleColour;
                     border: 1px solid @SubtleBorderColour;