Universal scylla/skeletyl thumb cluster

[bstiq]

Goal: revamp the thumb cluster to make it compatible with both 5-key and 3-key thumb clusters.

TODO

• move rgb connector
• move resistor and capacitor
• add "cut here" line
• update rev number
• add vcc/gnd silkscreen
• add 2 dout connector, for 5 key and 3 key thumb cluster
• reroute rgb
• drc
• order prototype
• test 4x6
• test 3x5
• update matrix in qmk

[bstiq]

Issue: for the skeletyl/mini, only the middle 4 pins of the connector are useable. One of those pins is mapped to a key that will be cut off, and needs to be re-wired.
This means the firmware for the charybdis and scylla will need to be changed

[bstiq]

current status

[bstiq]

Note: since the new elite C holder has a different pinout and will require a revamp of the config files, changing the pinout for those 2 columns doesn't seem like a reach either.
Then the V2 config in qmk will be for elite-c holder 2.x and thumb clusters 3.0

[bstiq]

Tested on right Charybdis and left Scylla, works.