tools, app-tools: move gimp-debug-tool from tools/ to app-tools/
Move gimp-debug-tools.c from tools/ to a new app-tools/ subdir, which should contain external tools needed by app/, and which is built *after* app/ (unlinke tools/). This allows gimp-debug-tool to depend on libapp and libappwidgets, instead of on actual source files from app/. Building sources from app/ in another subdir screws with the distclean rules, and breaks distcheck.
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