mod: helper derive accepts type object as parent not only functions.
add: endscreen controller ready but not connected.
upd: level-schema.
mod: level-end spots with "found" property trigger success end-screen.
mod: small style refinement for endscreen.
mod: if stats drop below null the corresponding fail endscreen is triggered.
fix: endscreen is only triggered for several statistic values.
upd: for endscreen merge.
upd: endscreens.