robot wave scenario (#1556)

![image](https://github.com/swarm-game/swarm/assets/261693/5952ccb9-02fe-47af-9a22-b45b130316e2)

# Demo

    scripts/play.sh -i data/scenarios/Challenges/wave.yaml --autoplay

data/scenarios/Challenges/00-ORDER.txt

@@ -11,6 +11,7 @@ hanoi.yaml
 hackman.yaml
 lights-out.yaml
 bucket-brigade.yaml
+wave.yaml
 wolf-goat-cabbage.yaml
 blender.yaml
 friend.yaml

data/scenarios/Challenges/_wave/solution.sw

@@ -0,0 +1,15 @@
+def go =
+    move;
+    go;
+    end;
+
+def start =
+    turn right;
+    wait 5;
+    try {
+        go;
+    } {};
+    grab;
+    end;
+
+start;

data/scenarios/Challenges/wave.yaml

@@ -0,0 +1,89 @@
+version: 1
+name: Wave
+author: Karl Ostmo
+description: |
+  Ride the wave
+creative: false
+objectives:
+  - goal:
+      - |
+        Grab the `bitcoin`{=entity} at the east end of the path.
+        Don't let the patrolling robots catch you!
+    prerequisite:
+      not: got_caught
+    condition: |
+      as base {has "bitcoin"};
+  - id: got_caught
+    teaser: Got caught
+    optional: true
+    hidden: true
+    goal:
+      - |
+        The robots caught you!
+    condition: |
+      as base {x <- meet; return $ case x (\_. false) (\_. true)};
+robots:
+  - name: base
+    dir: [0, 1]
+    devices:
+      - branch predictor
+      - comparator
+      - dictionary
+      - grabber
+      - hourglass
+      - clock
+      - lambda
+      - logger
+      - net
+      - scanner
+      - strange loop
+      - treads
+  - name: wavebot
+    system: true
+    dir: [0, 1]
+    display:
+      invisible: false
+      attr: 'plant'
+    program: |
+      def crossPath =
+          move; move; move; move; move; move;
+          turn back;
+          wait 5;
+          end;
+      def go =
+          crossPath;
+          go;
+          end;
+      def start =
+          pos <- whereami;
+          wait $ fst pos;
+          go;
+          end;
+      start;
+solution: |
+   run "scenarios/Challenges/_wave/solution.sw"
+entities: []
+known: [wavy water, water, bitcoin]
+world:
+  dsl: |
+    overlay
+    [ {dirt, water}
+    , if (x + y / 2) % 5 == 0 then {dirt, wavy water} else {blank}
+    ]
+  upperleft: [-3, 6]
+  offset: false
+  palette:
+    'B': [grass, erase, base]
+    'w': [grass, erase, wavebot]
+    'x': [dirt, water]
+    'z': [grass, bitcoin]
+    '.': [grass, erase]
+  map: |
+    xxxxxx..................................................................................................................................................................................................................................................xxxxxx
+    xxx........................................................................................................................................................................................................................................................xxx
+    x............................................................................................................................................................................................................................................................x
+    B............................................................................................................................................................................................................................................................z
+    x............................................................................................................................................................................................................................................................x
+    xxx........................................................................................................................................................................................................................................................xxx
+    xxxxxxwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwxxxxxx
+    

test/integration/Main.hs

@@ -216,6 +216,7 @@ testScenarioSolutions rs ui =
         , testSolution (Sec 3) "Challenges/word-search"
         , testSolution (Sec 10) "Challenges/bridge-building"
         , testSolution (Sec 5) "Challenges/ice-cream"
+        , testSolution (Sec 15) "Challenges/wave"
         , testSolution (Sec 3) "Challenges/arbitrage"
         , testSolution (Sec 10) "Challenges/gopher"
         , testSolution (Sec 5) "Challenges/hackman"