2.4.0: Full of changes for end of the year

🚧 Release notes can be found here. For more information, visit the official website.

• Added Episode logos/images to episode selection
• Added asynchronous loading to custom level selection
• Added AppImage packages – all dependencies and Content directory is already in the package (Linux only)
• Added support for JJ2+ ammo crates (event 54)
• Show upgraded ammo pickup if player has upgraded weapon
• Reset current weapon to Blaster if player has no ammo in current weapon on checkpoint
• Changed to use "$XDG_DATA_HOME/{NCINE_LINUX_PACKAGE}/" path for Cache and Source instead of "$XDG_DATA_HOME/Jazz² Resurrection/" on Linux ({NCINE_LINUX_PACKAGE} is still set to to "Jazz² Resurrection" by default in CMake)
• Various internal performance optimizations
• Improved some sprites
• Improved 3D sound
• Improved Sounds section in Options (long press is supported now)
• Updated Italian translation by @Hexaae
• Updated Polish translation by @Patrxgt
• Updated Romanian translation by @1NSH4N3
• Adjusted Pinball Bumper
• Adjusted Bird's fire rate
• Replaced libdeflate with zlib-ng on Windows to fix random crashes (zlib is used everywhere now)
• Fixed transition between standing and crouching while shooting
• Fixed Fast Fire power up and default fire rate
• Fixed Raven enemy
• Fixed Bolly boss and Uterus boss
• Fixed Pepper explosion
• Fixed destructable blocks on Continue
• Fixed Esc key in main menu