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The goal of the QMK software project is to develop a completely customizable, powerful, and enjoyable firmware experience for any project - keyboard or otherwise - and to provide helpful, encouraging, and kind support and feedback for people with any software development experience.

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Refactor quantum/split_common/i2c.c, quantum/split_common/serial.c

This PR allows for both i2c and serial support for Split Keyboards (aka Split Common code) to be enabled at the same time, without causing any overlap/issues.

It also adds some compiler optimization to properly handle this.