Gtk2::CodeGen enhancements

[muppet <scott asofyet org>]

f you are working on an extension outside of gtk2-perl-xs cvs and you 
use Gtk2::CodeGen->write_boot in your Makefile.PL (or you couldn't 
because it was broken), then this is important to you.  if not, then 
you can happily ignore this.


write_boot was broken.  now it's fixed in CVS, but it may break your 
code if you did anything fancier than "Gtk2::CodeGen->write_boot;"  
none of the modules in gtk2-perl-xs did anything fancy, but they do now.


the purpose of write_boot is to write an xsh file which is included 
from the BOOT: section of the xs file that actually gets booted by the 
bootstrap call in your pm file.  it is imperative that you do not 
include the boot symbol for that module in the boot.xsh, or you get an 
infinite loop.  however, the previous heuristic for ignoring the 
already-booted module was broken --- it just ignored any package name 
with colons in it.  this works for Gtk2 and Gnome2, but not for 
Gnome2::Print or Gnome2::Canvas.  that rather sucks.

the fix was to pass in a regex that specifies the package name(s) to 
ignore.  of course, this means that the arguments passed to write_boot 
have changed (they sucked anyway, so this is not a bad thing), but none 
of the defaults have changed.

GnomeCanvas/Makefile.PL and GnomeCanvas/xs/GnomeCanvas.xs have already 
been modified to take advantage of this.  (whereas before the change it 
simply couldn't use write_boot and i had to code the boot by hand, like 
in Glib/Glib.xs)


write_boot passed some stuff to grep; grep isn't a common thing on 
windows (yes, i was trying to build a native gtk2-perl on windows 
today, more on that in a couple of days), so i fixed it to read the 
files directly.  this actually sped things up from 0.510 seconds to 
0.410 seconds on my athlon.  natch.


i have another version of the module with new POD in it, but it's on a 
machine i can't get to from here, so that'll have to wait until 
tomorrow.