nintendo switch port

[ITotalJustice]

• [x] fix compiling for the switch
• [x] deko3d backend for imgui (using ftpd version with nx-shell's changes)
• [ ] imgui console frontend layout / design
• [x] audio support
• [x] file browser
• [ ] CI
• [ ] hw renderer using deko3d (will do this after vulkan hw renderer)
• [ ] libusbhsfs supoort

imgui deko3d backend in ftpd https://github.com/mtheall/ftpd/tree/master/source/switch imgui deko3d backend in nxshell https://github.com/joel16/NX-Shell/tree/deko3d/source/imgui_nx