Add caseSensitive option for combofields, use for source=*

(closes #4558)

data/presets/fields.json

@@ -1738,6 +1738,7 @@
             "universal": true,
             "label": "Sources",
             "snake_case": false,
+            "caseSensitive": true,
             "options": [
                 "survey",
                 "local knowledge",

data/presets/fields/source.json

@@ -5,6 +5,7 @@
     "universal": true,
     "label": "Sources",
     "snake_case": false,
+    "caseSensitive": true,
     "options": [
         "survey",
         "local knowledge",

data/presets/schema/field.json

@@ -115,6 +115,11 @@
             "description": "If true, replace spaces with underscores in the tag value (combo type fields)",
             "type": "boolean",
             "default": true
+        },
+        "caseSensitive": {
+            "description": "If true, allow case sensitive field values (combo type fields)",
+            "type": "boolean",
+            "default": false
         }
     },
     "additionalProperties": false