Refactor message sending #2249

Job	Run time
Check formatting	13s
Check MSRV	1m 32s
Lint macOS 64bit	4m 57s
Lint iOS 32bit	1m 9s
Lint GNUStep + exceptions	1m 39s
Lint header-translator	40s
Lint test-assembly	38s
Test macOS 12	6m 34s
Verify header translator output	1m 18s
Assembly tests	1m 13s
${{ matrix.name }}	0s
Check icrate features	0s
Test Compiler-RT	30s
Test GNUStep with libobjc2 v1.9	2m 55s
Test on iOS simulator w. dinghy	0s
Test GNUStep with libobjc2 v2.0	3m 3s
Compiler UI	2m 1s
Test GNUStep with libobjc2 v2.1 on nightly	3m 58s
Test GNUStep 32bit	3m 2s
	35m 22s

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