#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
StarSystem:ExportToLua() does not return anything
add FileSystem::SanitiseFileName
be safer about the generated file-name in ExportToLua
update bundled Lua to version 5.2.2

5.2.2 is a bug-fix release; everything should still work the same way.
Merge pull request #2229 from johnbartholomew/fix-lua-system-export

Fix lua system export
Merge pull request #2228 from Luomu/improve-instancing

Model loader: improve instancing
EQUATORIAL_RADIUS_TO_POLAR_RADIUS_RATIO - data/lang/Polski.txt
Merge pull request #2183 from UncleVasya/Mission_list_sort

Solution for #2128 -  Sort missions list
Merge pull request #2230 from johnbartholomew/lua-522

Update bundled Lua to version 5.2.2
Update Changelog.txt
Update Changelog.txt
Update Czech.txt

* 1 new token; SHA: 9b94c76
* typo; radius is not diameter!
* some linguistic/grammary changes, to better fit in Czech mouth
Merge remote-tracking branch 'radius75/Polski.txt'