second step options: factor out common parts of irq_session_component.cc options: use on foc arm no proxy threads Fixes #1456
Move it to platform specific .cc file, so that it may get re-implemented platform specifically if needed. Issue #1446
This patch changes the top-level directory layout as a preparatory step for improving the tools for managing 3rd-party source codes. The rationale is described in the issue referenced below. Issue #1082
