Update v .4.5 : The pursuit of aesthetics

This update further enhances the game's aesthetics, notably by revamping the User Interface with a more modern, minimalist tone.

• User Interface rework.
• Improved arenas background with atmospheric gradients.
• Stands were also reworked. (where players get customized before deathmatch).
• fixed : fps drop when menu display at game start.
• fixed : a robot mesh part (knee) was not correctly mirrored from left part to right part.