new loplugin: VCL widget reference checker
new loplugin: VCL widget reference checker

First stage of new VCL widget reference checker

Change-Id: I63a2108a26b3c0e0a896d13672b1daa6f8e60b3a

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core