Add example of record which supports RPC and a client

Record has x and y-coordinate fields and a timestamp and also provides
a service which sets (x,y) to a sequence of values.

An RPC client application (move) sends positions as an array.

exampleRPC/ioc/Db/dbStringArray.db

@@ -0,0 +1,5 @@
+record(waveform, "${name}")
+{
+        field(NELM,"5")
+        field(FTVL,"STRING")
+}