BareMetal template, bug fixes and more!

[AnErrupTion]

This is a PR that cherry-picks changes from #1124.

• Removed remaining TestWorld demo launch script
• Implemented Mosa.Kernel.BareMetal.BootSettings.EnableDebugOutput and set it to false in BareMetal unit test runner
• Made the template use the BareMetal kernel
• Updated documentation to reflect all the changes
• Simplified NuGet package structure and added BareMetal to it
• Restored macOS demo testing
• Fixed HelloWorld x86 demo entry point
• Made template use Mosa.Tools.Package.Qemu by default