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.cpp

@@ -0,0 +1,21 @@
+#include "UnitConversions.h"
+
+float UnitConversions::CelsiusToFahrenheit(float celcius)
+{
+    return (celcius * 9) / 5 + 32;
+}
+
+float UnitConversions::MetersPerSecondToKnots(float metersPerSecond)
+{
+    return metersPerSecond * 1.94384;
+}
+
+float UnitConversions::MetersPerSecondToMilesPerHour(float metersPerSecond)
+{
+    return metersPerSecond * 2.23694;
+}
+
+float UnitConversions::HectoPascalToInchesOfMercury(float hectoPascal)
+{
+    return hectoPascal * 0.029529983071445;
+}