Add an Add Ons button to start screen that loads mp installer #2642

Job	Run time
freebsd	0s
fedora	0s
clang-format Code Formatter	4m 47s
nix	0s
Additional compile flags in Ubuntu	8m 16s
Ubuntu (ubuntu-22.04, gcc)	6m 0s
macOS	11m 20s
Ubuntu (ubuntu-22.04, gcc, Release)	6m 10s
WebAssembly	0s
Ubuntu (ubuntu-22.04, gcc, Debug)	6m 35s
Windows MSYS2 (gcc)	11m 39s
Ubuntu (ubuntu-22.04, gcc, RelWithDebInfo)	7m 31s
Windows Clang	0s
Ubuntu (ubuntu-22.04, clang)	5m 56s
Ubuntu (ubuntu-22.04, clang, Release)	6m 42s
Ubuntu (ubuntu-22.04, clang, Debug)	7m 15s
	1h 22m 11s

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