docs: Update theme_template with missing options

Synchronize theme_template with the current codebase by adding all
themeable preferences and color attributes that were previously
undocumented.
Remove 'wins.autotidy' option which is no longer used.

theme_template

@@ -26,6 +26,7 @@ main.text.me=
 main.text.them=
 main.text.history=
 main.splash=
+main.help.header=
 main.time=
 main.trackbar=
 input.text=
@@ -100,6 +101,7 @@ privileges=
 presence=
 intype=
 enc.warn=
+tls.show=
 resource.title=
 resource.message=
 statuses.console=
@@ -112,6 +114,7 @@ roster.by=
 roster.order=
 roster.unread=
 roster.count=
+roster.count.zero=
 roster.priority=
 roster.size=
 roster.wrap=
@@ -132,6 +135,7 @@ roster.rooms.order=
 roster.rooms.unread=
 roster.rooms.pos=
 roster.rooms.by=
+roster.rooms.title=
 roster.rooms.char=
 roster.rooms.private.char=
 roster.private=
@@ -140,15 +144,26 @@ occupants=
 occupants.size=
 occupants.char=
 occupants.jid=
+occupants.offline=
 occupants.wrap=
 occupants.indent=
 occupants.header.char=
-wins.autotidy=
 otr.char=
 pgp.char=
 omemo.char=
 console.muc=
 console.chat=
 console.private=
+statusbar.show.name=
+statusbar.show.number=
+statusbar.self=
+statusbar.chat=
+statusbar.room.title=
+statusbar.tabs=
+statusbar.tablen=
+titlebar.muc.title=
+titlebar.position=
+mainwin.position=
+statusbar.position=
 inputwin.position=
 correction.char=