Fix desktop export, add support for OGG, and improve docs

🐛 Bug fixes

• Fix broken desktop export, as well as non-catched errors
• Fix textures' "frame count" property not working (#120) by @island205 🎉
• Update parameter names in ct.sprite's readme

⚡ General improvements

• Add support for OGG audio files

Docs

• 🐛 Fix the use of ct.height in Making Shooter tutorial when ct.viewHeight is needed
• ⚡ Change the title of "Troubleshooting: Background splits into squares!" so that it covers tiles as well
• Add a page "Troubleshooting: Sounds don't play at the game start!"
• Document ct.u.degToRad, ct.u.radToDeg
• Document ct.u.rotate, ct.u.rotateRad