Migrate color picker to modern rendering pipeline

[Sychic]

Also bumps UC and Elementa to 421 and 710 respectively

[Johni0702]

For extra context on the switch to shader, here's the commit message from Essential's color picker:

Significantly reduces the amount of quads drawn from one per MC pixel to
just a single one, also fixes broken result on some resolutions caused
by incorrect rounding (1.33 - 0.33 may be 0.99 which should round to 1
but toInt usedd here gives 0).