feat(weather): [Weather] always_show_location names the place in every wx/gwx reply

wx and gwx name the place only when it adds information: a city outside default_state or default_country, or a position. always_show_location (default false) names every place a lookup finds instead, including cities in the bot's own state and ZIP codes.

For a ZIP code, gwx now does a reverse lookup when the option is on (it skipped that since the name was never shown), and wx reuses the reverse lookup it already did for a companion position. A failed lookup leaves the reply unnamed rather than repeating the ZIP code. The prefix comes out of the message budget as before. The option is in the wx settings schema for the web viewer, the example config, the command reference and the changelog.

docs/command-reference.md

@@ -193,7 +193,7 @@ wx
 
 **Units** follow `[Weather] temperature_unit` and `wind_speed_unit` (`[Wx_Command]` overrides them for `wx`). The default is °F and mph.
 
-**The place is named** in the reply only when it adds information: for a position (the sender's, the bot's or typed coordinates) when a place is found for it, and for a city in another state than `[Weather] default_state` (or any city, when `default_state` is not set). ZIP codes are not named.
+**The place is named** in the reply only when it adds information: for a position (the sender's, the bot's or typed coordinates) when a place is found for it, and for a city in another state than `[Weather] default_state` (or any city, when `default_state` is not set). ZIP codes are not named. With `[Weather] always_show_location = true`, every city, ZIP code and position a place is found for is named; the name takes message length from the forecast, and a ZIP code costs one extra reverse lookup.
 
 ---
 
@@ -224,7 +224,7 @@ gwx Reykjavik 10d
 
 **Units** follow `[Weather] temperature_unit`, `wind_speed_unit` and `precipitation_unit`.
 
-**The place is named** in the reply when it adds information: a city in another country than `[Weather] default_country` (in the US, another state than `default_state`, or any US city when `default_state` is not set), or a position a place was found for. A city in the bot's own region and ZIP codes are not named.
+**The place is named** in the reply when it adds information: a city in another country than `[Weather] default_country` (in the US, another state than `default_state`, or any US city when `default_state` is not set), or a position a place was found for. A city in the bot's own region and ZIP codes are not named. `[Weather] always_show_location = true` names every place a lookup finds, as for `wx`.
 
 **Custom sources:** a `custom.wxsim.<name>` or `custom.mqtt_weather.<name>` key in `[Weather]` answers `wx <name>` and `gwx <name>` from that station. WXSIM sources answer current conditions, `tomorrow` and `Nd`; MQTT sources answer current conditions only. Options a source cannot answer (`hourly` and `alerts` for both) reply that they are not available instead of sending the current conditions.