machinetalk/lib: fold various support functions into libmtalk.so

zeroconf, logging, protobuf utility code, avahi/czmq poll support, json/pb
conversion, ini helper
machinetalk/libmtalk: include files
syslog_async: remove from rtapi subdirectory

this is now subsumed in the libmtalk userland library.
machinetalk/support: demo files for en/decoding
machinetalk/scripts: conversion scripts for NML type tags
machinetalk/config-service: simple support server for remote UI's
machinetalk/config-server: QML demo files for QtQuickVCP
machinetalk: build support, dependency generator for protobuf files
hal/hal_glib.py: add remote HAL component support
gladevcp/makepins.py: support remote HAL components
python/servicediscovery: zeroconf support for gladevcp

A zeroconf browser connected via signals. Uses the avahi/dbus interface.
hal/gladevcp: adapt fore remote operation
gitignore generated files
src/Makefile: build support
src/configure.in: build support
src/configure.in: add cython.m4 support file
src/hal/cython/Submakefile support
src/Makefile.inc: convey symbols for libraries detected
scripts/rip-environment.in: export MACHINEKIT_INI
scrips/machinekit.ini.tmpl.in : add template file for etc/linuxcnc/machinekit.ini