Revert "der: add `Error::(set_)source`; remove `Clone` + `Copy` (#1328)" #652

Job	Run time
build (1.75.0, thumbv7em-none-eabi)	56s
minimal-versions	0s
build (1.75.0, wasm32-unknown-unknown)	1m 22s
build (stable, thumbv7em-none-eabi)	58s
test (1.75.0)	43s
build (stable, wasm32-unknown-unknown)	46s
test (stable)	44s
	5m 29s

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