Add ABB120 demo suite and docs

kdl-wasm/web/tests/fixtures/abb120/spec-programs/post/W2_P10_BrandHints.grl

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+language grl 0.1
+module W2BrandHints
+  post_hint abb
+  post_hint fanuc
+  post_hint kuka
+  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 main()
+    movej home speed v zone zf
+  end
+end

kdl-wasm/web/tests/fixtures/abb120/spec-programs/post/W2_P20_CrossBrandMotion.grl

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+language grl 0.1
+module W2CrossBrandMotion
+  post_hint abb
+  const speed vj = joint(50 %)
+  const speed vl = linear(200 mm/s)
+  const zone z10 = z(10 mm)
+  const zone zcnt = cnt(50)
+  target home = joint_target { joints: [0 deg, 0 deg, 0 deg, 0 deg, 0 deg, 0 deg] }
+  target pick = pose_target { pose: pose(500 mm, 0 mm, 0 mm, 0 deg, 0 deg, 0 deg) }
+  target mid = pose_target { pose: pose(550 mm, 50 mm, 0 mm, 0 deg, 0 deg, 0 deg) }
+  target place = pose_target { pose: pose(600 mm, 0 mm, 0 mm, 0 deg, 0 deg, 0 deg) }
+  proc main()
+    movej home speed vj zone fine
+    movel pick speed vl zone z10
+    movec via mid target place speed vl zone zcnt
+    io.do[1] = true
+    wait io.di[1] == true timeout 1 s
+    pulse io.do[2] duration 100 ms
+  end
+end

kdl-wasm/web/tests/fixtures/abb120/spec-programs/post/W2_P30_Roundtrip.grl

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+language grl 0.1
+module W2Roundtrip
+  const speed vj = joint(40 %)
+  const speed vl = linear(150 mm/s)
+  const zone z10 = z(10 mm)
+  target home = joint_target { joints: [0 deg, 0 deg, 0 deg, 0 deg, 0 deg, 0 deg] }
+  target pick = pose_target { pose: pose(500 mm, 0 mm, 0 mm, 0 deg, 0 deg, 0 deg) }
+  path roundtrip_path {
+    defaults { speed: vj, zone: z10 }
+    point p0 movej home zone fine
+    point p1 movel pick speed vl zone z10
+  }
+  operation roundtrip_op {
+    kind: handling
+    path: roundtrip_path
+    process {
+      generator: "working2"
+    }
+  }
+  proc main()
+    run_operation roundtrip_op
+    movej home speed vj zone fine
+  end
+end