Introduce /reload command

This command reloads the configuration file.

Fix https://github.com/profanity-im/profanity/issues/627

src/command/cmd_defs.c

@@ -2408,6 +2408,19 @@ static struct cmd_t command_defs[] =
         CMD_NOARGS
         CMD_NOEXAMPLES
     },
+
+    { "/reload",
+        parse_args, 0, 0, NULL,
+        CMD_NOSUBFUNCS
+        CMD_MAINFUNC(cmd_reload)
+        CMD_NOTAGS
+        CMD_SYN(
+            "/reload")
+        CMD_DESC(
+            "Reload preferences from configuration file.")
+        CMD_NOARGS
+        CMD_NOEXAMPLES
+    },
 };
 
 static GHashTable *search_index;

src/command/cmd_funcs.c

@@ -8551,3 +8551,12 @@ cmd_save(ProfWin *window, const char *const command, gchar **args)
     prefs_save();
     return TRUE;
 }
+
+gboolean
+cmd_reload(ProfWin *window, const char *const command, gchar **args)
+{
+    log_info("Reloading preferences");
+    cons_show("Reloading preferences.");
+    prefs_reload();
+    return TRUE;
+}

src/command/cmd_funcs.h

@@ -227,4 +227,5 @@ gboolean cmd_omemo_policy(ProfWin *window, const char *const command, gchar **ar
 gboolean cmd_omemo_clear_device_list(ProfWin *window, const char *const command, gchar **args);
 
 gboolean cmd_save(ProfWin *window, const char *const command, gchar **args);
+gboolean cmd_reload(ProfWin *window, const char *const command, gchar **args);
 #endif