.NET9 Upgrade + Various JS fixes

[thelilh]

Main fixes

• Try Catches for JS
• Included .NET9 in the latest package
• Made awaitable functions actually awaited
• Upgrade ZXing to V0.21.3

Various fixes

• Added MacOS+Rider gitignore to be able to assist with development
• Fixed various spelling mistakes
• Removed bloat that was unused and/or unnecessary

Questions:

• Should .NET6 still be supported since it's EOL was 12th of November, 2024 (i.e. around 3 weeks ago)