Add field display example

Author: jsimpso81

WPIlibMath_Examples_Pkg/WPILIB_Math_Examples_Package.lvproj

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+{
+  "game": "FIRST Power Up",
+  "field-image": "2018-field.jpg",
+  "field-corners": {
+    "top-left": [125, 20],
+    "bottom-right": [827, 370]
+  },
+  "field-size": [54, 27],
+  "field-unit": "feet"
+}

WPIlibMath_Examples_Pkg/examples/Vision/FieldDisplay/FieldInfo/2018-field.jpg

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+{
+"game" : "Destination: Deep Space",
+"field-image" : "2019-field.jpg",
+"field-corners": {
+	"top-left" : [217, 40],
+	"bottom-right" : [1372, 615]
+},
+"field-size" : [54, 27],
+"field-unit" : "foot"
+}

WPIlibMath_Examples_Pkg/examples/Vision/FieldDisplay/FieldInfo/2018-powerup.json

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+{
+    "game" : "Infinite Recharge",
+    "field-image" : "2020-Field.png",
+    "field-corners": {
+        "top-left" : [96, 25],
+        "bottom-right" : [1040, 514]
+    },
+    "field-size" : [52.4375, 26.9375],
+    "field-unit" : "foot"
+    }

WPIlibMath_Examples_Pkg/examples/Vision/FieldDisplay/FieldInfo/2019-deepspace.json

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+{
+    "game": "Barrel Racing Path",
+    "field-image": "2021-barrel.png",
+    "field-corners": {
+      "top-left": [20, 20],
+      "bottom-right": [780, 400]
+    },
+    "field-size": [30, 15],
+    "field-unit": "feet"
+  }