Add `RawMouseEvent` which allows negative positions (fixes a bug) #3

Job	Run time
cargo fmt	10s
cargo doc (windows-latest)	1m 18s
cargo clippy + test (windows-latest)	1m 6s
cargo doc (macos-latest)	1m 16s
cargo clippy + test (macos-latest)	58s
cargo doc (ubuntu-latest)	32s
cargo clippy + test (ubuntu-latest)	26s
	5m 46s

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