Normalise mouse keycodes

[fauxpark]

Description

KC_MS_UP -> QK_MOUSE_CURSOR_UP KC_MS_U -> MS_UP KC_MS_DOWN -> QK_MOUSE_CURSOR_DOWN KC_MS_D -> MS_DOWN KC_MS_LEFT -> QK_MOUSE_CURSOR_LEFT KC_MS_L -> MS_LEFT KC_MS_RIGHT -> QK_MOUSE_CURSOR_RIGHT KC_MS_R -> MS_RGHT KC_MS_BTN1 -> QK_MOUSE_BUTTON_1 KC_BTN1 -> MS_BTN1 KC_MS_BTN2 -> QK_MOUSE_BUTTON_2 KC_BTN2 -> MS_BTN2 KC_MS_BTN3 -> QK_MOUSE_BUTTON_3 KC_BTN3 -> MS_BTN3 KC_MS_BTN4 -> QK_MOUSE_BUTTON_4 KC_BTN4 -> MS_BTN4 KC_MS_BTN5 -> QK_MOUSE_BUTTON_5 KC_BTN5 -> MS_BTN5 KC_MS_BTN6 -> QK_MOUSE_BUTTON_6 KC_BTN6 -> MS_BTN6 KC_MS_BTN7 -> QK_MOUSE_BUTTON_7 KC_BTN7 -> MS_BTN7 KC_MS_BTN8 -> QK_MOUSE_BUTTON_8 KC_BTN8 -> MS_BTN8 KC_MS_WH_UP -> QK_MOUSE_WHEEL_UP KC_WH_U -> MS_WHLU KC_MS_WH_DOWN -> QK_MOUSE_WHEEL_DOWN KC_WH_D -> MS_WHLD KC_MS_WH_LEFT -> QK_MOUSE_WHEEL_LEFT KC_WH_L -> MS_WHLL KC_MS_WH_RIGHT -> QK_MOUSE_WHEEL_RIGHT KC_WH_R -> MS_WHLR KC_MS_ACCEL0 -> QK_MOUSE_ACCELERATION_0 KC_ACL0 -> MS_ACL0 KC_MS_ACCEL1 -> QK_MOUSE_ACCELERATION_1 KC_ACL1 -> MS_ACL1 KC_MS_ACCEL2 -> QK_MOUSE_ACCELERATION_2 KC_ACL2 -> MS_ACL2

Types of Changes

• [x] Core
• [ ] Bugfix
• [ ] New feature
• [x] Enhancement/optimization
• [ ] Keyboard (addition or update)
• [x] Keymap/layout/userspace (addition or update)
• [x] Documentation

Issues Fixed or Closed by This PR

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] I have read the PR Checklist document and have made the appropriate changes.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] I have tested the changes and verified that they work and don't break anything (as well as I can manage).