Refactoring progress towards integrating client configs

BUILD

Makefile

build.json

gRPC.podspec

src/core/channel/child_channel.c

src/core/channel/child_channel.h

src/core/channel/client_channel.c

src/core/channel/client_channel.h

src/core/channel/client_setup.c

src/core/channel/client_setup.h

src/core/client_config/lb_policy.h

src/core/client_config/subchannel.h

src/core/surface/channel.h

src/core/surface/channel_create.c

tools/doxygen/Doxyfile.core.internal

vsprojects/grpc/grpc.vcxproj

vsprojects/grpc/grpc.vcxproj.filters

vsprojects/grpc_unsecure/grpc_unsecure.vcxproj

vsprojects/grpc_unsecure/grpc_unsecure.vcxproj.filters