Refactor(English): Rename all files and identifiers from Dutch to English

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>

pacman-project/tests/all-tests.rkt

@@ -0,0 +1,24 @@
+#lang r7rs
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;                              All Tests                                    ;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Runs all ADT tests. Open this file and evaluate to run everything.
+
+(import (scheme base)
+        (pp1 tests)
+        (prefix (pacman-project tests test-position) position:)
+        (prefix (pacman-project tests test-maze) maze:)
+        (prefix (pacman-project tests test-pacman) pacman:)
+        (prefix (pacman-project tests test-score) score:)
+        (prefix (pacman-project tests test-timer) timer:))
+
+(define (test-all)
+  (position:test)
+  (maze:test)
+  (pacman:test)
+  (score:test)
+  (timer:test))
+
+(test-all)