Refactor techmap classes

1. Match class is moved to match.h from subnet_techmapper_base.h
2. Characteristics and CellContext structs moved to techmap_estimator.h from subnet_techmapper_base.h
   2.1. Introduced new name space for techmap estimation utilities: eda::gate::techmapper::estimator
3. Updated constructors of SubnetTechMapperBase and SubnetTechMapperPCut classes to ease configuration and future extension
   3.1. Changed cutProvider from external function to virtual method in SubnetTechMapperBase class\

Crresponding Intellect changes in branch tm_refactor1