Build

fixes and improvements (overflow-checks) #148

Job	Run time
build_no_default_features (macos)	2m 9s
build_feature_electrum (windows)	5m 54s
build_feature_esplora (linux)	6m 26s
build_feature_esplora (windows)	5m 32s
build_no_default_features (windows)	5m 16s
build_feature_electrum (macos)	2m 41s
build_all_features (nightly, windows)	5m 52s
build_all_features (stable, macos)	2m 42s
build_feature_esplora (macos)	2m 33s
build_all_features (1.88.0, windows)	5m 32s
build_all_features (1.88.0, macos)	2m 52s
build_all_features (nightly, linux)	2m 32s
build_all_features (stable, linux)	6m 45s
build_all_features (1.88.0, linux)	2m 40s
build_all_features (nightly, macos)	2m 39s
build_feature_electrum (linux)	2m 37s
build_all_features (stable, windows)	4m 22s
build_no_default_features (linux)	2m 0s
	1h 11m 4s

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