Add skill designations

Fix drag and drop for skills and skill categories named the same
Set sane default values for attributes
Removed deprecated no grid sheets

rmss/templates/sheets/skills/rmss-skill-sheet.html

@@ -10,6 +10,12 @@
                 {{selectOptions owned_skillcats selected=selected_skillcat }}
             </select>
         </div>
+        <div>
+            Skill Designation
+            <select name="system.designation" class="app-stat-selector" value="{{system.designation}}" itemid="{{ item._id }}">
+                {{selectOptions designations selected=system.designation}}
+            </select>
+        </div>
         <div>
             <table>
                 <tr>