[sldev] Initial viewer/object communication code

[Dale Glass]

I've been working on a general solution to the problem. See the wiki 
for a detailed explanation:

https://wiki.secondlife.com/wiki/LSL_To_Client_Communication

I've been working on the code and have just finished the first draft.

There are two parts to this, the viewer side, and the LSL script side. 
The script side is explained in the wiki. The viewer side works like 
this:

#include "llviewercommunication.h"
const LLString EXT_NAME = "DaleGlass.Echo";
const U32      EXT_VERSION = 1;

// This gets called when the script sends something to our name
void echo(LLString& data, LLViewerCircuit& circuit, void* userdata)
{
	llinfos << "I got: " << data << llendl;
	circuit.sendReply(data);
}

Plugin::Plugin()
{
	// Register callback
	gViewerCommunication->registerExtension( 
		LLViewerExtension(EXT_NAME, EXT_VERSION, echo, NULL,
		"Dale Glass", "Echo extension") );
}

LSL code (connection establishment not shown):
llOwnerSay("$VwrComm$0$DaleGlass.Echo$This will be echoed at me");

The code is in SVN here:
http://svn.daleglass.net/sl/branches/viewercomm/

The patch is here:
http://daleglass.net/viewercomm.patch

Here is the LSL script that tests the above patch:
http://daleglass.net/viewercomm_test.lsl

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