inno: move inno installer files to contrib/packaging/inno
Let's isolate the inno installer files to their own directory
so the separation between things is clearer.
This required adjusting a few relative paths and references to
the old directory.
Differential Revision: https://phab.mercurial-scm.org/D6059
#if no-windows no-osx
$ mkdir -p xdgconf/hg
$ echo '[ui]' > xdgconf/hg/hgrc
$ echo 'username = foobar' >> xdgconf/hg/hgrc
$ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
$ unset HGRCPATH
$ hg config ui.username 2>/dev/null
foobar
#endif