add survey point fields (#271)

data/fields/survey_point/datum_aligned.json

@@ -0,0 +1,5 @@
+{
+  "key": "survey_point:datum_aligned",
+  "type": "check",
+  "label": "Aligned to the local geodetic datum"
+}

data/fields/survey_point/purpose.json

@@ -0,0 +1,12 @@
+{
+  "key": "survey_point:purpose",
+  "type": "combo",
+  "label": "Purpose",
+  "strings": {
+    "options": {
+      "horizontal": "Horizontal Alignment",
+      "vertical": "Vertical Alignment",
+      "both": "Both"
+    }
+  }
+}

data/fields/survey_point/structure.json

@@ -0,0 +1,21 @@
+{
+  "key": "survey_point:structure",
+  "type": "combo",
+  "label": "Structure",
+  "strings": {
+    "options": {
+      "beacon": "Beacon",
+      "block": "Block",
+      "pole": "Pole",
+      "pillar": "Pillar",
+      "bracket": "Bracket",
+      "plaque": "Plaque",
+      "medallion": "Medallion",
+      "cairn": "Cairn",
+      "pin": "Pin",
+      "indented_pin": "Indented pin",
+      "cut": "Cut",
+      "magnet": "Magnet"
+    }
+  }
+}