Rename to Flags, tweak flag controls

- Display post "destructiveControls" in flag instead of custom buttons
- Make flags more versatile/extensible
- Delete associated flags when a post is deleted

Uninstall the Reports extension before installing.

extensions/flags/less/forum/extension.less

@@ -1,34 +1,32 @@
-.Post--reported {
+.Post--flagged {
   padding-top: 0 !important;
   border: 2px solid @primary-color;
 }
 
-.Post-header .item-reported {
+.Post-header .item-flagged {
   display: block;
   margin: 0;
 }
-.Post-reported {
+.Post-flagged {
   background: @primary-color;
   margin-top: -2px;
   margin-bottom: 20px;
   margin-left: -22px;
   margin-right: -22px;
-
-  @media @tablet-up {
-    margin-left: -22px - 85px;
-    text-align: right;
-  }
-
   padding: 10px;
   border-radius: @border-radius @border-radius 0 0;
   overflow: hidden;
   .light-contents(@color: @body-bg; @control-color: @body-bg);
 
+  @media @tablet-up {
+    margin-left: -22px - 85px;
+  }
+
   &, a {
     color: @body-bg !important;
   }
 }
-.Post-reported-summary {
+.Post-flagged-flags {
   @media @tablet-up {
     float: left;
   }
@@ -38,16 +36,21 @@
   text-align: left;
   font-weight: bold;
 }
-.Post-reported-detail {
+.Post-flagged-detail {
   font-size: 12px;
-  margin-top: 5px;
+  margin-left: 10px;
   font-weight: normal;
 }
-.Post-reported-actions .Button {
+.Post-flagged-actions {
+  @media @tablet-up {
+    float: right;
+  }
+}
+.Post-flagged-actions .Button {
   margin-left: 5px;
 }
 
-.ReportsDropdown .Dropdown-toggle {
+.FlagsDropdown .Dropdown-toggle {
   .Button-label,
   .Button-caret {
     display: none;