Custom proxy support built on C++ RCC worker support
Required changes to assembly management and property accessors
Add runcondition support to the C++ RCC model
Support "SpecFile=" option in "make new" for workers with no spec.

adapt/os/ocpios/interfaces/include/OcpiOsTimer.h: simplified timer API for seconds/nanoseconds
components/Makefile: add proxy.rcc example of control proxy workers
components/proxy.rcc: ditto
components/hello_world.rcc/hello_world.c: fix warnings
core/application/include/OcpiApplication.h: control proxy support
core/application/src/OcpiApplication.cxx: ditto
core/application/src/ocpirun_main.cxx: fix doc inconsistency: 'w' for selecting worker.
core/container/ctests/bin/src/test_timeout_worker_main.cxx: fix test of success
core/container/hdl/include/HdlWciControl.h: update property access interface/APIs for proxies
core/container/hdl/src/HdlContainer.cxx: ditto
core/container/hdl/src/HdlWciControl.cxx: ditto
core/container/hdl/src/ocpihdl_main.cxx: ditto
core/container/interfaces/include/OcpiContainerApi.h: ditto
core/container/interfaces/include/OcpiContainerApplication.h: ditto
core/container/interfaces/include/OcpiContainerArtifact.h: ditto
core/container/interfaces/src/OcpiContainerApplication.cxx: ditto
core/container/interfaces/src/OcpiContainerArtifact.cxx: ditto
core/container/interfaces/src/OcpiProperty.cxx: ditto
core/container/ocl/src/OcpiOclContainer.cxx: ditto
core/container/rcc/include/OcpiRccApplication.h: ditto
core/container/rcc/src/OcpiRccApplication.cxx: ditto
core/library/include/OcpiLibraryAssembly.h: ditto - significant refactoring
core/library/src/OcpiLibraryAssembly.cxx: ditto
core/util/assembly/include/OcpiUtilAssembly.h: add basic master/slave support
core/util/assembly/src/OcpiUtilAssembly.cxx: ditto
core/util/property/include/OcpiUtilImplementation.h: ditto
core/util/property/include/OcpiUtilPropertyApi.h: ditto, plus slave property support
core/util/property/src/OcpiUtilImplementation.cxx: ditto
core/container/rcc/include/OcpiRccWorker.h: proxy support, and c++ runcondition support
core/container/rcc/include/RCC_Worker.h: ditto
core/container/rcc/src/OcpiRccWorker.cxx: ditto
core/util/ezxml/include/OcpiUtilEzxml.h: convenience: have getOptionalString return boolean
core/util/ezxml/src/OcpiUtilEzxml.cxx: ditto
tools/cdk/examples/fsk_modem_xml/Makefile: fix reference to internal header
tools/cdk/include/lib.mk: support empty SpecFile
tools/ocpigen/include/wip.h: slave support, and initial package namespaces for worker names
tools/ocpigen/src/assembly.cxx: ditto
tools/ocpigen/src/parse.cxx: ditto
tools/ocpigen/src/rcc.cxx: control proxy code gen support
tools/cdk/examples/xml/proxybias.xml: simple proxy test