Add a light-weight platform abstraction layer for we/websocket communication
and dynamic loading of libraries that implemented a IPlugin interface.

This is the bases for loading and exposing the refsw_server software on the
dawn platform.
Added the surface compositor (refsw_server) into the buildroot.
Legacy code from Nexus requires C compiler to compile sucessfully (no casting on void*) adde C compiler.
Merge branch 'refsw_server' of https://github.com/Metrological/buildroot into refsw_server
Aligned the cppsdk package and the webbridge with the current state of buildroot.
Added correct dependencies in the MK file for correct build order.
EGL driver from broadcom will, depending on the availability of a SurfaceCompositor,
build, using the service compositor or build as a stand-alone.
Merge pull request #64 from Metrological/refsw_server

Refsw server