Moved duplicating Sema and IRGen scope implementation into ASTScope

examples/funcDecl.dusk

include/dusk/AST/CMakeLists.txt

include/dusk/AST/Scope.h

include/dusk/Frontend/CompilerInstance.h

include/dusk/IRGen/CMakeLists.txt

include/dusk/IRGen/Context.h

include/dusk/IRGen/IRGenerator.h

include/dusk/IRGen/Scope.h

include/dusk/Sema/CMakeLists.txt

include/dusk/Sema/Sema.h

lib/AST/CMakeLists.txt

lib/AST/Scope.cpp

lib/Frontend/CompilerInstance.cpp

lib/IRGen/CMakeLists.txt

lib/IRGen/Context.cpp

lib/IRGen/GenDecl.cpp

lib/IRGen/GenExpr.cpp

lib/IRGen/GenStmt.cpp

lib/IRGen/IRGenerator.cpp

lib/IRGen/Scope.cpp