For ESP8266, I want to auto discover the toolchains and friends
installed into Eclipse. I also want to handle toolchain files
manually added by the user. Adding providers and listeners.
Adds prefix to gcc commands. Makes CMake config provider for Local
only. ESP8266 has it's own launch config. Add build output to the
build config model. And fix up output folders.
Change-Id: I682c3d08898e5ca275d07f8bb63c6ec1c7605a81
