Transition from QtCore to stdc++ / STL / boost

This looks like a pretty major change, but in reality,
80% of it is just renames of types and corresponding
methods.

The config parsing code has been completely replaced
with a boost::program_options based version. This
means that the config file format slightly changed
(checkout the updated README).

I still expect there to be bugs / unforseen events.
Those should be fixed in follow up commits.

Also, finally reverted back to using pkg-config to
locate and link libruby. Yay for less hacks!

binding-mruby/etc-binding.cpp

@@ -24,8 +24,6 @@
 #include "binding-types.h"
 #include "serializable-binding.h"
 
-#include <QDebug>
-
 #define ATTR_RW(Type, attr, arg_type, mrb_val, arg_t_s) \
 	MRB_METHOD(Type##Get_##attr) \
 	{ \