Move fetching quotes info to gnc-commands

It needs gnc-prefs which I don't want to add by default to gnucash-cli.

gnucash/gnucash-cli.cpp

@@ -131,24 +131,7 @@ Gnucash::GnucashCli::start ([[maybe_unused]] int argc, [[maybe_unused]] char **a
     {
         if (*m_quotes_cmd == "info")
         {
-            GncQuotes quotes;
-            if (quotes.cmd_result() == 0)
-            {
-                std::cout << bl::format (bl::translate ("Found Finance::Quote version {1}.")) % quotes.version() << "\n";
-                std::cout << bl::translate ("Finance::Quote sources: ");
-                for (auto source : quotes.sources())
-                    std::cout << source << " ";
-                std::cout << std::endl;
-                return 0;
-            }
-            else
-            {
-                std::cerr << bl::translate ("Finance::Quote isn't "
-                                            "installed properly.") << "\n";
-                std::cerr << bl::translate ("Error message:") << "\n";
-                std::cerr << quotes.error_msg() << std::endl;
-                return 1;
-            }
+            return Gnucash::quotes_info ();
         }
         else if (*m_quotes_cmd == "get")
         {

gnucash/gnucash-commands.cpp

@@ -352,6 +352,30 @@ scm_report_list ([[maybe_unused]] void *data,
     return;
 }
 
+int
+Gnucash::quotes_info (void)
+{
+    gnc_prefs_init ();
+    GncQuotes quotes;
+    if (quotes.cmd_result() == 0)
+    {
+        std::cout << bl::format (bl::translate ("Found Finance::Quote version {1}.")) % quotes.version() << "\n";
+        std::cout << bl::translate ("Finance::Quote sources: ");
+        for (auto source : quotes.sources())
+            std::cout << source << " ";
+        std::cout << std::endl;
+        return 0;
+    }
+    else
+    {
+        std::cerr << bl::translate ("Finance::Quote isn't "
+                                    "installed properly.") << "\n";
+        std::cerr << bl::translate ("Error message:") << "\n";
+        std::cerr << quotes.error_msg() << std::endl;
+        return 1;
+    }
+}
+
 int
 Gnucash::add_quotes (const bo_str& uri)
 {

gnucash/gnucash-commands.hpp

@@ -32,6 +32,7 @@ using bo_str = boost::optional <std::string>;
 
 namespace Gnucash {
 
+    int quotes_info (void);
     int add_quotes (const bo_str& uri);
     int run_report (const bo_str& file_to_load,
                     const bo_str& run_report,