Fix the size of some items and blocks

• Fix camera focus on block placed in free-mapping mode
• Improve camera update

• Fix a crash when no custom items or blocks

• Add a filter bar
• Fix 0 byte size for blocks in Items directory
• Fix sort when opening the plugin

Fix wrong size for TM2020

1.2 changes:

• Minor changes to remove warning logs

1.1 changes:

• Fix cam focus on blocks placed in free mapping (thanks zayshaa)
• Add a color to the name depending of the trigger (CP, start,...)
• Add support of Maniaplanet
• Use the new plugin file format