Rename `Stretch`, `Style`, `Weight` to have `Font` prefix #678

Job	Run time
cargo check (msrv) (android) (armv7-linux-androideabi)	44s
cargo check (msrv) (windows-latest)	1m 0s
cargo clippy (android) (armv7-linux-androideabi)	1m 1s
cargo check (msrv) (android) (aarch64-linux-android)	28s
cargo clippy (windows-latest)	3m 0s
cargo check (msrv) (macos-latest)	27s
cargo clippy (android) (aarch64-linux-android)	1m 46s
cargo check (msrv) (android) (x86_64-linux-android)	41s
cargo clippy (macos-latest)	48s
cargo check (msrv) (ubuntu-latest)	22s
cargo clippy (android) (x86_64-linux-android)	59s
cargo clippy (ubuntu-latest)	1m 0s
cargo doc (windows-latest)	1m 19s
cargo test (windows-latest)	1m 44s
typos	5s
cargo doc (macos-latest)	22s
cargo test (macos-latest)	44s
formatting	24s
cargo test (ubuntu-latest)	27s
cargo doc (ubuntu-latest)	24s
	17m 45s

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