Some little fixes
First attempt at caching tangents meshes
Second try of my previous pull request, which was partially reverted due to caused crashes and memory leaks
Merge remote-tracking branch 'upstream/master'
This will (hopefully) solve the memory leaks in dynamic ribbons and image button widgets
Issue #1588

Fixed crashes in track info screen
Use specmap value
Added limited lazy-load flag to avoid loading of all font textures
(most of which might not be needed). Fixes #1592.
Merge branch 'master' of github.com:supertuxkart/stk-code
Fix #1602
Use specmap on others mats
Convert remaining shaders
Fix #1438
Some fixes
Additionnal fixes
Try to emulate enery conservation
Revert "Revert "Prepare shader for specmap value""

This reverts commit 780482edba2b0de3358f7e2139db3de3318f729e.
Merge branch 'specmap'
Fix godray opacity
Fix splatting