* generator/*.cs: Add a LogWriter class which formats warnings
consistently on the console. Supports the concept of non-fatal
validation warnings, since it doesn't rely on the unrolling of the
validation stack to associate a warning to a given type.
Main purpose was to add a non-fatal warning for missing element_type
attributes on list return values, though it results in cleaner log
output, and also updates some warning messages to be more helpful in
how to resolve them.
* generator/InterfaceGen.cs: don't grab the StreamWriter for consume-only.
* generator/InterfaceVM.cs: don't bitch or fail validation when missing
target on consume-only.
* generator/ObjectBase.cs: support a target_method attr on vms to point the
callback invocations at when the names don't match.
* gio/Gio.metadata: marks a few more ifaces consume-only until somebody
complains they need to implement one of them.
Add support for virtual methods(vm) to the generator.
* parser/gapi2xml.pl: Generate a class_struct element with
all members of the class structure. Dump the first (instance)
parameter for signal and vm elements. Bump up parser version.
* generator/GObjectVM.cs: Added. Support for GObject virtual methods.
* generator/DefaultSignalHandler.cs: Signal specific part of vm
generation.
* generator/InterfaceVM.cs: New class for interface vms.
* generator/ObjectBase.cs: Parse the class struct.
svn path=/trunk/gtk-sharp/; revision=131604
