Use new editor for valuesColor in Parameter dialog

Closes #193 (closed)

Closes #59 (closed)

Closes #239 (closed)

• Use ValueColorEdit for valuesColor in Parameter dialog

• Refactored creation of cell editors in database editor

• Fix regex used to validate valueColors

• Consolidate about plot types into one place

  This file contains the SQL statements needed to update the database

  update_value_colors.sql