#2128 -  Sort missions list
New table widget with column sort support
SmartTable: added ui:Label as a default widget for cells. Now user has no need to specify widgets if he's okay with Labels in table.
Stable sort.
Create one StaticGeometry node per aiMesh, and reuse them when possible
Merge pull request #2228 from Luomu/improve-instancing

Model loader: improve instancing
Merge pull request #2183 from UncleVasya/Mission_list_sort

Solution for #2128 -  Sort missions list