hgext3rd: move 'drophack' as 'evolve.hack.drophack' Yet another extension migrating. Ideally we would implement stripping obsolescence marker in code soon and be able to dispose of this extensions directly. In the mean time this goes into the "hack" namespace.

syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes