Rename temp::Cfg to temp::Context #456

Job	Run time
build-windows-pr (dev, x86_64-pc-windows-msvc)	16m 59s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	9m 11s
build-windows-stable	0s
build-windows-master	0s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	2m 45s
build-linux-pr (dev, aarch64-linux-android)	2m 29s
build-windows-pr (release, x86_64-pc-windows-msvc)	7m 44s
build-linux-pr (release, x86_64-unknown-linux-gnu)	4m 36s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	3m 52s
build-linux-master	0s
build-linux-pr (release, aarch64-linux-android)	3m 26s
build-linux-stable	0s
build-macos-aarch64 (dev, aarch64-apple-darwin)	12m 34s
build-macos-aarch64 (release, aarch64-apple-darwin)	2m 50s
build-macos-x86_64 (dev, x86_64-apple-darwin)	15m 50s
build-all-features (x86_64-unknown-linux-gnu)	14m 19s
build-macos-x86_64 (release, x86_64-apple-darwin)	5m 0s
build-freebsd	28m 29s
check	2m 29s
doc	4s
conclusion	1s
	2h 12m 38s

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