Gigantic update - 1.6.0

• Mostly added multi language UI support - for now only English and German are supported - German translator: Vito
• Added MacOS support - finally targeting all 3 major platforms
• MacOS + ZLE is in limited functionallity - Squared not available due to Apple not supporting newer OpenGL versions
• All .zle files can now be opened directly from the file explorer on Windows, no need to move them to the Projects folder
• Added point and directional lights
• Added hitboxes to sprites, tilemaps, texts and vertex objects
• Added cameras as level objects -> removed Render button
• Added basic right click functionallity in files and main view
• Added prevention for duplicate instances of ZLE since opening the same project twice can break the project
• Added an option to set a project as the default when opening or let ZLE automatically reopen the last project
• Added a "future plans" section
• Added a new ZLE header file: ZTB.h - some parts of which are used by ZLE and me for my games
• ZLE header files now require C++17
• Added more advanced Lua error detection
• New files window design (increased icon sizes, buttons moved to right click)
• Default example shader uses OpenGL 2.1 instead of 3.0 because of MacOS
• Added automatic object naming (when creating new objects an available name is used)
• Added autosave setting
• Added an option to show other objects while editing tilemap
• Changed multithreading system - should now be more stable
• Reworked particle system hitbox detection
• Extended Z drawing layer from -100 & 100 to -128 & 127
• Removed setting: "Save camera settings" as it is saved in the level save file itself
• Settings are now saved in a JSON format
• Fixed the backup feature being broken on Windows due to 0x0D0A
• Added visual frame time graph
• Removed Save shader as image button due to the Render button (camera)
• Removed set origin button on sprites
• Renamed Level.h to ZLE.h
• Split namespaces into files -> zle:: in ZLE.h, squ:: now in Squared.h
• Fixed broken internal drag and drop
• Fixed shader error buttons being too small
• Fixed packaging which added a useless Backup folder instead of a Backups folder