Allow screens/options/sections to be displayed based on conditionals

[BoweFrankema]

Allow dashboard options, screens or sections to be shown based on conditions that have been set. Here's a basic example

[balance_buddypress_protect]
section = "buddypress"
title = "Private Community"
type = "radio"
field_options[] = "on=On"
field_options[] = "off=Off"
default_value = "off"

condition = "is_main_site"

This would allow a lot more flexibility especially in Multisite enviroments or 3rd Party plugins.