Added (excluded) Dropzone Module for more comprehensive module example (#4098)

* DropzoneModule hello world

* Buttoning things up

* Exclude by default

* Upstream refs

* Cleanup

* Add modules folder to path

* Case and path matters

* Exclude from header

* Guard

src/modules/Telemetry/UnitConversions.h

@@ -0,0 +1,10 @@
+#pragma once
+
+class UnitConversions
+{
+  public:
+    static float CelsiusToFahrenheit(float celcius);
+    static float MetersPerSecondToKnots(float metersPerSecond);
+    static float MetersPerSecondToMilesPerHour(float metersPerSecond);
+    static float HectoPascalToInchesOfMercury(float hectoPascal);
+};