HTML5 <input type="color"> for theme editing

Both textual input and color input at same time! Slightly different layout.

@hj this is pretty nice, could you fix the CSS of the two rightmost buttons?

added 68 commits

• 6796d30c...d97e6777 - 66 commits from branch pleroma:develop
• 71bdbdf1 - wip, styles are a bit broken tho
• 338245eb - updated css and stuff for color picker in styles

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unmarked as a Work In Progress

changed title from WIP: Aych Tee Ehm El Foive for theme editing to HTML5 for theme editing

changed the description

merged

mentioned in commit 7957489a