merge pre- and post-fader processor boxes; start removing Placement (not finished...

merge pre- and post-fader processor boxes; start removing Placement (not finished) ; add -DWAF_BUILD and use per-directory foobar-config.h to correctly pick up configure-time settings like HAVE_OGG ; check for libgiomm (part of upgrade to newer gtk stack); 32 bit marker reload fix from 2.X; audiounit IO config cache fix from 2.X; multi-add route template fix from 2.X; plugin GUI delete fix from 2.X; solo button labels are A or P for listen mode

git-svn-id: svn://localhost/ardour2/branches/3.0@5344 d708f5d6-7413-0410-9779-e7cbd77b26cf