Add ABB120 demo suite and docs

kdl-wasm/web/tests/fixtures/abb120/spec-programs/static/W2_E10_ExpressionDiagnostics.grl

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+language grl 0.1
+module W2ExpressionDiagnostics
+  const speed v_ok = linear(100 mm/s)
+  const speed v_unknown_symbol = linear(missing_symbol mm/s)
+  const speed v_unknown_function = linear(no_such_function(1) mm/s)
+  const speed v_bad_arity = linear(atan2(1) mm/s)
+  const speed v_domain = linear(sqrt(-1) mm/s)
+  const speed v_div_zero = linear(100 mm/s / 0)
+  const zone z_unit = z(10 mm + 1 s)
+  target home = joint_target { joints: [0 deg, 0 deg, 0 deg, 0 deg, 0 deg, 0 deg] }
+  proc main()
+    movej home speed v_ok zone fine
+  end
+end

kdl-wasm/web/tests/fixtures/abb120/spec-programs/static/W2_E20_SemanticDiagnostics.grl

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+language grl 0.1
+module W2SemanticDiagnostics
+  const speed v = joint(30 %)
+  const speed v = joint(40 %)
+  const zone zf = fine
+  target home = joint_target { joints: [0 deg, 0 deg, 0 deg, 0 deg, 0 deg, 0 deg] }
+  proc set_done(out bool done)
+    done = true
+  end
+  func bool bad_func()
+    wait io.di[1] == true
+    return true
+  end
+  proc main()
+    call set_done(true)
+    call missing_proc()
+    movej missing_target speed v zone zf
+  end
+end

kdl-wasm/web/tests/fixtures/abb120/spec-programs/static/W2_E40_ControlFlowDiagnostics.grl

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+language grl 0.1
+module W2ControlFlowDiagnostics
+  var int mode = 1
+  proc main()
+    break
+    continue
+    jump inner
+    if mode == 1
+      label inner
+    end
+    switch mode
+      case 1
+        break
+      case 1
+        break
+      case mode + 1
+        break
+    end
+    jump missing
+  end
+end