Spirc: Replace Mecury with Dealer #2144

Job	Run time
cargo fmt	4s
cargo +stable clippy (ubuntu-latest)	3m 0s
cargo +1.75 check (ubuntu-latest)	4m 4s
cargo +1.75 check (windows-latest)	6m 52s
cargo +stable check (ubuntu-latest)	5m 7s
cross +1.75 build armv7-unknown-linux-gnueabihf	1m 11s
cargo +stable check (windows-latest)	6m 55s
cargo +beta check (ubuntu-latest)	3m 18s
cross +stable build armv7-unknown-linux-gnueabihf	1m 8s
cross +1.75 build aarch64-unknown-linux-gnu	1m 26s
cross +stable build aarch64-unknown-linux-gnu	1m 3s
cross +1.75 build riscv64gc-unknown-linux-gnu	1m 18s
cross +stable build riscv64gc-unknown-linux-gnu	53s
	36m 19s

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