Add RGB matrix & LED Matrix support for IS31FL3742A, IS31FL3743A, IS31FL3745, IS31FL3746A

[MasterSpoon]

Adding a ISSI Common driver that adds support for 4 newer drivers and sets up backbone to bring further drivers onboard through a more central process.

Have added hooks for RGB and LED Matrix to allow selection of IS31FLCOMMON driver.
Added driver to allow swapping in config files for different ISSI models as all share common operation
Added config files for IS31FL3742A, IS31FL3743A, IS31FL3745, IS31FL3746A
Updated docs with how to configure new features

Have been able to test on hardware IS31FL3743A, the other three are assumed to be functional by association as they are operated in the same manner. Have done a dummy config and compile for all the 3 other drivers to ensure they compile correctly however have not been hardware tested at this stage.

I have used the existing configurations and drivers as examples of how to layout and configure to try keep my coded in line with the current coding in the repo.

Both the led_matrix_drivers.c and rgb_matrix_drivers.c have drivers that are the fall back if nothing else defined so have placed hooks for common driver before there.

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[drashna]

Has some merge conflicts

[MasterSpoon]

Updated conflicts and formatted in line with #14760 (which is much nicer then it was by the way, thank you fauxpark)

[drashna]

Discord discussion about this, starting here:
https://discord.com/channels/440868230475677696/867530715192885269/904495820995432448

for future drashna's reference

[drashna]

This has some merge conflicts that need to be resolved.

[MasterSpoon]

Resolved merge conflicts.

[stale]

Thank you for your contribution!
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[noroadsleft]

Not super familiar with the relevant features, but I don't see anything concerning here.

__attribute__ ((weak)) ✔️