* 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.
* Add modifier state to the split transport
This adds modifier state to the i2c and serial transport for split
keyboards. The purpose of this is to allow e.g. displaying modifier
state on the slave side of a split keyboard on an oled. This adds one
byte to the data transferred between halves.
This also fixes a missing ifdef guard for BLACKLIGHT_ENABLE.
Break modifiers into real/weak/oneshot
Fix incorrect slave serial mod setting
Fix typo in serial weal mod setter
Fix build errors for the I2C code that I introduced
Code cleanup and formatting per project preferences
Correctly get oneshot mods
Fix missing braces
Remove unneeded ifdef guard
Make the added state transport optional
Add documentation for the new define to enable this feature
Fix stray grave mark
* Fix error introduced in conflict resolution
* Initial stab at some fake dfu-util-split-left behaviour
* Apply suggestions from code review
Co-Authored-By: fauxpark <fauxpark@gmail.com>
* Clang format fixes
* Fake eeprom init for both left and right hand
