remotenames: introduce new template keywords for remotenames This patch introduces three new template keywords 'remotenames', 'remotebookmarks', 'remotebranches' to show remotenames, remotebookmarks and remotebranches associated to a changeset. This is a part of moving hgremotenames extension to core. The remotenames template keyword was present in the extension and the rest of the two are not present in the hgremotenames extension and are introduced in this patch. hgremotenames: https://bitbucket.org/seanfarley/hgremotenames Differential Revision: https://phab.mercurial-scm.org/D1759