Add webhelper extension and support for loading extensions

New phpdbg commands:
dl [path] - loads module / Zend extension
wait - waits for incoming connection from a phpdbg_webhelper module

Webhelper module is a UNIX domain socket to which a SAPI with the phpdbg_webhelper module loaded will write to the socket information about its whole environment.
phpdbg can then run the request locally [TODO: write the request back to the sender]
Fix segfaults, reorder files and set filename to exec
Do not unload phpdbg module in any case
Add transfer of output back to webserver and merge master in

Conflicts:
	config.m4
	phpdbg.c
	phpdbg.h
	phpdbg_cmd.c
	phpdbg_prompt.c
Fix (system) ini entry transfer
Disable automatic resetting of imported auto_globals
Merge branch 'webdata_transfer'