hex mode similar to chrome-devtools:
* Ctrl-Up/Down for R channel
* Shift-Up/Down for G channel
* Alt-Up/Down for B channel
* Up/Down treats the entire color as a hex integer e.g. #00f -> #010
rgb/hsl modes similar to chrome-devtools:
* Ctrl-Up/Down steps by 100 (alpha: by 1)
* Shift-Up/Down steps by 10 (alpha: by .1)
* Up/Down steps by 1 (alpha: by .01)
* PgUp/PgDn to switch format
* Tab to switch format when at the first/last input field
* uses the last submitted color by default
* doesn't insert the default color until a change or the Enter key
* fix a few bugs in colorpicker introduced in the rewrite
* full rewrite of colorview.js to make it 10-100 times faster (render on demand via extendMode)
* full rewrite of colorpicker.js to simplify CSS
* automatic light/dark theme based on current color of the editor
* fixes, tweaks, speedups
* color spot will always be on the left of its text i.e. no line break on wrapping
* support #RRGGBBAA and #RGBA hex colors
* support "transparent" as rgba(0, 0, 0, 0)
* HEX/hex toggle
* fix HSLA regexp
* Esc/Enter key to close
* innerHTML -> textContent
* toggle the feature correctly
* fade out before autohiding
* always show alpha 1 like devtools does
* set cursor:pointer only on the clickable part of the sliders
* bigger color format switcher with a tooltip
* autofocus input on open, disable spellcheck
* try not to obscure the source color spot & text
* restore focus without scrolling
