fix: make color picker use v-model and propsync

[pedrolamas]

This PR refactors the AppIroColorPicker and AppColorPicker to use v-model and propsync where possible, thus making the control easier to consume, and fixing the reported issue.

Note: following up on what we already do with our custom input controls, changing the value on the text input boxes will not take effect unless Enter is pressed.

Fixes #1372

[pedrolamas]

@matmen I know you also have an incoming PR with work on this area, I made it easy to integrate your changes in this one (just by using the new currentRed, currentGreen, currentBlue and currentWhite props)

[matmen]

I've opened a PR on your repo that fixes the color settings not applying in the metrics settings, otherwise these changes LGTM

[pedrolamas]

Oops, I forgot to change those @change to @input... I just send a new commit da41abe that from me tests fixes the issue!