Remove unnecessary engine releases within script engine lifetime
Merge branch 'master' of https://github.com/supertuxkart/stk-code into ScriptCache
Added basic caching for scripts
Merge branch 'master' of https://github.com/supertuxkart/stk-code into ScriptCache
Added map container for script cache
Added basic line callback
Disabled callback for now
Fix box particules starting at 0. 0. 0.
Prevent rendering too much point light scattering
Tweak nitro for new engine
Merge pull request #1649 from sachith500/ScriptCache

Script cache
make nitro emit light. The effect is not perfect yet, but already quite cool
Fixed crash in track info screen after changing resolution.

Widgets after changing resolution are deleted, but TrackInfoScreen object and m_screenshot variable still exsist. Therefore check if it's not NULL isn't enough.
Added a config file which can be used to disable certain graphical
options dependeing on card, os, driver version.
Do not use 0,0,0 as default sun position when unspecified, as this will give unpredictable results when normalized
Ignore billboard text nodes in physics, fixes #1666
Use CS for gaussian6
Try to fix crash at startup.
Merge branch 'master' of github.com:supertuxkart/stk-code
Prevent online user names starting with 0-9 (for #1471).