DeskHop v0.41

Minor updates and code refactor

- Code refactor, still far from great but a bit less crappy
- Unify behavior - Mouse Zoom feature was made toggle and
  moved from ALT to Right ALT + Right CTRL to avoid interfering
  with OS
- Added optional screensaver "Pong" mode, prevents sleep and it's fun
- Added checksum and version format support for flash config

DeskHop v0.4

- Support for storing config in flash
- Support for keyboard and mouse in any port (hopefully)
- Single-sided operation should work with a USB hub
- Added mouse switch cursor height/offset simple calibration
- Added per-screen settings support
- Mouse speed is configurable per-screen and per-axis
- Small fixes and cleanup
- Added LED feedback
- Squashed some bugs

DeskHop v0.31 - VID/PID change

Kindly assigned by the Raspberry Pi foundation, the project got its own
VID/PID so removing the current "test" one and adding this one. No other
changes.

DeskHop v0.3 - bugfixes, better device support

DeskHop v0.3 - Bugfixes and improvements:
=================================

Added 1000 Hz polling.
(Hopefully) fixed Logitech mouse issues
Removed special treatment for 12 and 16-bit mice
Increased mouse queue size
Increased current allowance from 100mA to 500mA
Allow mouse to wake up a suspended host

DeskHop v0.2

Some of the features implemented in this release are:
  - TinyUSB used to handle HOST management as well
  - USB hub support (tried an ancient one and it worked)
  - Early and buggy support for mouse on the keyboard side
    but have no unified usb receivers to test
  - Rudimentary HID report descriptor parsing, support for
    mice that don't send wheel data unless in report protocol mode
  - Implemented queueing for keyboard/mouse messages with
    hid report send verification
  - Split firmware upgrade shortcut to two, now it's
             left-shift + F12 + A + right shift to write board A
             left-shift + F12 + B + right shift to write board B
  - Fixed keyboard stuck in outputing chars if you hold down a key
    and change screens while doing it
  - Implemented cursor hiding, so the screen we are moving away from
    parks cursor at top right corner and it looks more natural and
    feels intuitive
  - Implemented switch lock, use Ctrl + L to lock and unlock
    desktop switching
  - Implemented jump threshold, works like barrier opacity - you can
    define if mouse immediately jumps over or you need to give it a bit
    of a "nudge"