Remove unnecessary rtiostreamtest implementation for MLink
We don't generate rtiostream library for host anymore
Use LCT to specify src/inc paths instead of full name
Make LED block compatible with PIL in model reference
TMF: use rtiostream directory instead of MLink

This rule is for External mode
Remove unused functions from gpio.h
Fix newlines at the end of files
Use mdaq_net from Simulink blocks for rtiostream as well

Therefore we don't need these files
Drop host-side implementation of external mode

We will use shipping TCP/IP with Embedded Coder, don't need these files
No need for set up for External mode
We use shipping ext_comm for External mode
TMF: add mdaq_net source files for External mode
Fix newline here as well
Use correct prototype for mdaq_net_init in header
PIL mode: use shipping TCP/IP rtiostream library for host
PIL mode: use correct paths for includes and src

Also add required mdaq_net source files to build.
Rename external mode transport
Update external mode demo model to use TCP/IP transport for Extmode
Add rtiostream interface file for TCP/IP

This is based on
matlabroot\rtw\c\src\ext_mode\common\rtiostream_interface.c