config: add a new [command-templates] section for templates defined by hg The existing `[templates]` section lets the user define their own keys and then refer to them on the command line with `-T`. There are many cases where hg wants to use a user-defined template with a given name, such as `ui.logtemplate` and `ui.mergemarkertemplate`. This patch starts moving such configs in a common section by moving `ui.logtemplate` to `command-templates.log` (with an alias from the old name, of course). Differential Revision: https://phab.mercurial-scm.org/D9245

--- a/tests/test-commandserver.t	Mon Oct 26 10:08:22 2020 -0700
+++ b/tests/test-commandserver.t	Fri Oct 23 10:56:18 2020 -0700
@@ -982,8 +982,8 @@
   $ cd repo3
 
   $ cat <<EOF >> $HGRCPATH
-  > [ui]
-  > logtemplate = {rev} {desc|firstline} ({files})\n
+  > [command-templates]
+  > log = {rev} {desc|firstline} ({files})\n
   > 
   > [extensions]
   > failafterfinalize = $TESTTMP/failafterfinalize.py