CDM-40 final refactor pre-4.0 release

- moving package from datastax.cdm to com.datastax.cdm
- refactoring out CqlHelper
- adding schema auto-detection
- removing generic 'property getter' pattern from Features
- making data type conversion universal and generic, not just isolated to UDT
- refactoring how CQL statements are managed

Author: mieslep

src/resources/sparkConf.properties

@@ -266,7 +266,6 @@ spark.cdm.perfops.writeRateLimit                  40000
 #               because some type values contain commas, e.g. lists, maps, sets, etc.
 #-----------------------------------------------------------------------------------------------------------
 #spark.cdm.feature.constantColumns.names        const1,const2
-#spark.cdm.feature.constantColumns.types        0,1
 #spark.cdm.feature.constantColumns.values       'abcd',1234
 #spark.cdm.feature.constantColumns.splitRegex   ,