Adding the makefile options ADB_MOUSE_ENABLE and ADB_MOUSE_ACCMAX.
Might have gone overboard with comments, and tried but failed at not
adding more than necessary outside the converter/adb_usb/ folder.

b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk'
7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5

git-subtree-dir: tmk_core
git-subtree-split: b9e0ea08cb

Keypresses would be forgotten if they began while ghosting, even if they
were still pressed after ghosting ended.

https://github.com/dastels/tmk_keyboard/tree/master/converter/sun3_usb

7967731 Update README

git-subtree-dir: tmk_core
git-subtree-split: 7967731b8b

git-subtree-dir: tmk_core
git-subtree-split: 05caaccec9

- Proximity feature
- Reduce strength of vibration
- Change number of layers to 32