Drop the extra resources/ subdirectory

This subdirectory gets in the way when integrating the inspector
build more fully with GTK+, and does not really add anything.
Just move everything one level up.
Drop an unused variable

This is another leftover from when we were doing export checks.
Drop redundant include
Drop a nonexisting variable
List formatting cleanup

Always put sublists first.
Split subdirectory file lists off

This moves a little closer to a proper nonrecursive setup, and
makes the gtk Makefile.am less monstrous.
inspector: Build nonrecursively
Use subdir-objects in gtk/
Quiet some make rules
quartz: Copy annotations

Better than juggling introspection sources in the Makefile.
Don't use escapes in echo strings

This forces us to fight with echo non-portability. Instead,
just use ' instead of \".