Refactor message sending #2265

Job	Run time
Check formatting	11s
Lint macOS 64bit	7m 25s
Test GNUStep with libobjc2 v1.9	3m 41s
Lint iOS 32bit	1m 41s
Check MSRV	1m 42s
Test GNUStep with libobjc2 v2.0	2m 26s
Lint GNUStep + exceptions	2m 10s
Test GNUStep with libobjc2 v2.1 on nightly	4m 18s
Lint header-translator	36s
Test GNUStep 32bit	2m 34s
Lint test-assembly	42s
Test macOS 12	6m 13s
Verify header translator output	51s
Assembly tests	1m 5s
Compiler UI	2m 33s
Test Compiler-RT	48s
Check icrate features	0s
Test on iOS simulator w. dinghy	0s
${{ matrix.name }}	0s
	38m 56s

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