Remove instances of HTML5 input type="color" due to inconsistent browser support

## What does this MR do?

`<input type="color" />` renders differently across browsers.  Reverting to `type="text"` where necessary.

## Screenshots (if relevant)

Safari (top) vs Chrome (bottom)
![Screen_Shot_2016-09-28_at_11.53.02_AM](/uploads/f967ed988320cbd2e4357cdfcfe7a813/Screen_Shot_2016-09-28_at_11.53.02_AM.png)

See merge request !6576