UnicodePlots: disable some unsupported examples

src/examples.jl

@@ -1249,7 +1249,33 @@ _backend_skips = Dict(
         51,  # image with custom axes
     ],
     :inspectdr => [4, 6, 10, 22, 24, 28, 30, 38, 43, 45, 47, 48, 49, 50, 51, 55],
-    :unicodeplots => [6, 10, 22, 24, 28, 38, 43, 45, 47, 49, 50, 51, 55],
+    :unicodeplots => [
+        6,  # embedded images unsupported
+        10,  # histogram2d
+        13,  # markers unsupported
+        16,  # subplots unsupported
+        17,  # grid layout unsupported
+        20,  # annotations unsupported
+        21,  # custom markers unsupported
+        22,  # contours unsupported
+        24,  # 3D unsupported
+        26,  # subplots unsupported
+        28,  # heatmap
+        29,  # layout unsupported
+        33,  # grid lines unsupported
+        34,  # framestyles unsupported
+        37,  # ribbons / filled unsupported
+        38,  # histogram2D 
+        43,  # heatmap with DateTime
+        45,  # error bars
+        47,  # mesh3D unsupported
+        48,  # markershapes unsupported
+        49,  # polar heatmap
+        50,  # 3D surface unsupported
+        51,  # embedded images unsupported
+        52,  # 3D quiver unsupported
+        55,  # 3D unsupported
+    ],
     :gaston => [
         2,  # animations
         31,  # animations