* Extensible split data sync capability through transactions.
- Split common transport has been split up between the transport layer
and data layer.
- Split "transactions" model used, with convergence between I2C and
serial data definitions.
- Slave matrix "generation count" is used to determine if the full slave
matrix needs to be retrieved.
- Encoders get the same "generation count" treatment.
- All other blocks of data are synchronised when a change is detected.
- All transmissions have a globally-configurable deadline before a
transmission is forced (`FORCED_SYNC_THROTTLE_MS`, default 100ms).
- Added atomicity for all core-synced data, preventing partial updates
- Added retries to AVR i2c_master's i2c_start, to minimise the number of
failed transactions when interrupts are disabled on the slave due to
atomicity checks.
- Some keyboards have had slight modifications made in order to ensure
that they still build due to firmware size restrictions.
* Fixup LED_MATRIX compile.
* Parameterise ERROR_DISCONNECT_COUNT.
This converts the array that the Swap Hands feature uses to use PROGMEM,
and to read from that array, as such. Since this array never changes at
runtime, there is no reason to keep it in memory. Especially for AVR
boards, as memory is a precious resource.
* Change PID to allow differentiation between Rev. 3 and Rev. 4
* Rebadge thumb keys in macro to show physical wiring better
* Add more rules for VIA keymap
* VIA Refactor
* Remove old code
* review changes
* review changes
* Fix cannonkeys/satisfaction75/prototype:via build
* Add via.h to quantum.h
* Move backlight init to after backlight config load
* Merge branch 'master' into via_refactor_pr
* Update user's rules.mk to new way of enabling VIA
* Added id_switch_matrix_state
* Review changes
* Migrate Nyquist rules.mk files to be version specific and update flash command
* Migrate Iris rules.mk files to be version specific and update flash command
