Time Series Graph - update product editor to allow color hex codes

[Steve Malers]

Time series product properties for color can typically only be edited using drop-down choice of supported colors. However, the software does support hex codes if they are added to time series product files with a text editor. The time series product editor needs to be updated to allow a hex code to be entered (and maybe also r,g.b,a?) to give the user flexibility to enter non-named colors, with transparency. This cold be done at a minim by changing ComboBoxes into SimpleJComboBox with text editing allowed. The color should be verified for syntax.

A more complex feature would be to add a color picker to select from a palette. That could be phased in later.