hs.mouse - fixes setMouseSpeed and adds trackpad support

[asmagill]

Adds support for getting and setting trackpad speed
Fixes #3744

The issue was that the value would be changed, and reflected in the appropriate system preferences panel, but it wouldn't actually be applied so there was no change in mouse behavior. This fix uses the deprecated functions IOHIDGetAccelerationWithKey and IOHIDSetAccelerationWithKey, but it works (for now).

Tested with Sonoma 14.7.4, should be tested with Sequoia.

If I come across anything that shows how to force the UI to update the HID settings to match what is in the IOKit HID dictionary, I may try reverting this and fixing it in a more "modern" way, but atm this is the only way I've found that actually makes the change take effect immediately.

(see https://stackoverflow.com/questions/10448843/mac-mouse-trackpad-speed-programmatically and https://web.archive.org/web/20150513175725/http://lists.apple.com/archives/usb/2004/Aug/msg00056.html)

[codecov]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.

Project coverage is 27.43%. Comparing base (20f27e5) to head (377af82).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3758      +/-   ##
==========================================
+ Coverage   27.06%   27.43%   +0.36%     
==========================================
  Files         191      191              
  Lines       51460    51471      +11     
==========================================
+ Hits        13926    14119     +193     
+ Misses      37534    37352     -182     

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