added contexts for CPs. added Model Extension Contruct for CPs from user interface

src/tmltranslator/TMLCPLib.java

src/tmltranslator/ctranslator/CPMEC.java

src/tmltranslator/ctranslator/CpuMemoryCopyMEC.java

src/tmltranslator/ctranslator/DataTransfer.java

src/tmltranslator/ctranslator/DoubleDmaMEC.java

src/tmltranslator/ctranslator/SingleDmaMEC.java

src/tmltranslator/ctranslator/TMLCCodeGeneration.java

src/ui/GTMLModeling.java

src/ui/tmldd/TMLArchiCPNode.java

src/ui/window/JDialogReferenceCP.java