Add support for emacs dumb-jump

Allow easy navigation to function definitions in emacs.

The rg (ripgrep) search is needed because as the dumb-jump README says:

   [...] the default searcher (git-grep) won't be able to search
   outside of the project root. This edge case will be fixed in a
   future release.

See: https://github.com/jacktasia/dumb-jump

.dir-locals.el

@@ -0,0 +1 @@
+((cperl-mode . ((dumb-jump-force-searcher . rg))))

.dumbjump

@@ -0,0 +1,2 @@
++bin/*.in
++lib/*.pm.in