WIP: use flags to distinguish between Orchard and Sapling scanning #2483

Job	Run time
Build target wasm32-wasi	3m 50s
Clippy (MSRV)	4m 20s
Bitrot check	4m 15s
Clippy (beta)	11s
Latest build on ubuntu-latest	1m 26s
Latest build on windows-latest	1m 26s
Code coverage	6m 59s
Intra-doc links	4m 58s
Latest build on macOS-latest	1m 44s
Rustfmt	17s
protobuf consistency	4m 8s
Test on ubuntu-latest	5m 14s
Test on ubuntu-latest with --features orchard	5m 30s
UUID validity	6s
Test on ubuntu-latest with --features unstable-nu6	5m 21s
Test on ubuntu-latest with --features zfuture	5m 21s
Test on windows-latest	5m 18s
Test on windows-latest with --features orchard	5m 15s
Test on windows-latest with --features unstable-nu6	4m 54s
Test on windows-latest with --features zfuture	5m 0s
Test on macOS-latest	5m 31s
Test on macOS-latest with --features orchard	5m 30s
	1h 26m 34s

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