Make Collapsible Groups Colorable

[WaitingIdly]

changes in this PR:

• make the background color and border color configurable per group.
  • add color(backgroundColor, borderColor) to ICollapsibleGroupRegistry.Builder.
  • default color is the prior defaults, named BACKGROUND_COLOR_SMOKE and BORDER_COLOR_SMOKE.
  • add color fields and a preview when editing a collapsible group.
• shrink the width of some buttons to make them a square.
• fix the collapsed display having an overlap in the border color (rendering the vertical and horizontal in the same spot).
• when rendering the collapsed group, use the same blend logic as when rendering the expanded group.
• when editing a collapsible group, only render the "ctrl+click" tooltip if there is a wildcard for the hovered ingredient.
• add a button the clear all selected ingredients in a group.
• when editing a collapsible group, move the search bar to the bottom (instead of the top).

related to #175