Support for Hex Colors

[awtkns]

We should support hex and rgb colors. We should also maybe have a default list containing mims colors?

@carluri Do you have a list of colors you would like?

[carluri]

Let's use these:

HEX: [
'#ff00ff',
'#00ebeb',
'#ffff00',
'#ff0000',
'#0084ff',
'#00f000'
'#ffaf00',
'#00d0ff',
'#b4ff69'
'#ff1493'
'#a020f0',
'#00ff7f',
'#ff7200',
'#40e0d0',
'#00b22f',
'#dc143c',
'#ee82ee',
'#daa520',
'#ff8cbe',
'#0000ff',
'#ffe100'
]


RGB: [
rgba(255,0,255,255),
rgba(0,235,235,255),
rgba(255,255,0,255),
rgba(255,0,0,255),
rgba(0,132,255,255),
rgba(0,240,0,255),
rgba(255,175,0,255),
rgba(0,208,255,255),
rgba(180,255,105,255),
rgba(255,20,147,255),
rgba(160,32,240,255),
rgba(0,255,127,255),
rgba(255,114,0,255),
rgba(64,224,208,255),
rgba(0,178,47,255),
rgba(220,20,60,255),
rgba(238,130,238,255),
rgba(218,165,32,255),
rgba(255,140,190,255),
rgba(0,0,255,255),
rgba(255,225,0,255)
]

[carluri]

Suggested color bar for VOIs