Added support for simulate commands

[JimJamUrCode]

A new configuration option is added to allow you to inform lirc_web that a remote within lirc should be referenced as a simulated device.
+Updated the marcros.js file to allow simulated devices to be a part of a macro.
+Minimal changes to systems, everything works the same, but now you can use simulated devices.
+Updated README.md

For this to work, lirc needs to be setup with some commands to simulate. Within your lircd.conf you need a remote similar to this:
remote.conf.txt

You must have an lircrc file setup that looks similar to the following file (note the file shouldn't have any extension, github wouldn't allow me to upload without a file extension). This file should be located in /etc/lirc/
lircrc.txt

This post by the raspberry pi foundation does a great job explaining how to setup lirc to support simulated commands.

Issues I had while coming up with this solution...

1. lirc changed from what I knew it as. lirc_options.conf is your friend.
2. lirc_node is partially broken, you need to update it like I mention in this issue.
3. irexec doesn't seem to load the lircrc file out of /etc/lirc/, so I have been needing to manually start it with this command: sudo irexec -d /etc/lirc/lircrc
4. You can manually test a simulate command by running something like this from the CLI: irsend SIMULATE "00000000000005d0 00 <COMMAND> <REMOTE>