menuconfig: Add a more 'make menuconfig'-like color scheme

Add an alternative, less yellow, more 'make menuconfig'-like color
scheme, contributed by Mitja Horvat (pinkfluid). The new theme is
selected by setting the MENUCONFIG_THEME environment variable to
'aquatic'.

Make it so that custom themes can override just the styles they want to
change from the default theme.

Perhaps some non-hardcoded theming mechanism could be added later, but
keep it simple for now.

Piggyback some related changes:

 - Make the selected item bold in the default theme, like the aquatic
   theme does.

 - Allow the style for the edit box in the jump-to dialog to be
   configured separately from the style for edit boxes in pop-up
   dialogs. That makes it possible to avoid some color clashes.

 - Remove a redundant style setting for the jump-to edit box. The window
   itself is already created with the correct style.

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