Improved Simantics/SCL module SCL module/script functionality

Improved Simantics/SCL module SCL module/script functionality

* Added new functions create{SCLModule,SCLScript,PGraph}R that return
  the created resource instead of returning ().
* Added new functions createSCL{Module,Script}WithDefinition for
  directly creating modules/scripts with a specific definition
* Added new functions set{SCLModule,SCLScript,PGraph}Definition for
  setting the definition specific to each entity.
* Added preliminary documentation for the module
* Deprecated create{SCLModule,SCLScript,PGraph} functions in favor of
  create...R

refs #7616

Change-Id: Ia2d97682eb184f5b0edd849f564ca05561938cb4