Renamed files: constanten→constants, adt-positie→adt-position,
adt-doolhof→adt-maze, adt-sleutel→adt-key, adt-tijdslimiet→adt-timer,
adt-teken→adt-draw, adt-spel→adt-game. All message names, variables,
comments, and tests converted to English.
Also fixed counter location bug (time-label x/y were swapped).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Tests for Positie, Doolhof, Pac-Man, Score, and Tijdslimiet ADTs
using check/check-eq?/run-test from (pp1 tests) library.
Centralized test runner in alle-testen.rkt with prefix imports.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>