Add SteerMouse (#1600)

Add SteerMouse to the "System Related Tools" section.

"SteerMouse is a utility that lets you freely customize buttons, wheels and cursor speed. Both USB and Bluetooth mice are supported."

Author: 8enSmith

README.md

@@ -1202,6 +1202,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
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+* [SteerMouse](https://plentycom.jp/en/steermouse/) - SteerMouse is a utility that lets you freely customize buttons, wheels and cursor speed. Both USB and Bluetooth mice are supported.
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