refactor: Add ArgsManager::GetSettingsList method

Add for consistency with ArgsManager::GetSetting method and to make setting
types accessible to ArgsManager callers and tests (test added next commit).

This commit does not change behavior.

src/util/system.cpp

@@ -352,11 +352,8 @@ Optional<unsigned int> ArgsManager::GetArgFlags(const std::string& name) const
 
 std::vector<std::string> ArgsManager::GetArgs(const std::string& strArg) const
 {
-    LOCK(cs_args);
-    bool ignore_default_section_config = !UseDefaultSection(strArg);
     std::vector<std::string> result;
-    for (const util::SettingsValue& value :
+    for (const util::SettingsValue& value : GetSettingsList(strArg)) {
-        util::GetSettingsList(m_settings, m_network, SettingName(strArg), ignore_default_section_config)) {
         result.push_back(value.isFalse() ? "0" : value.isTrue() ? "1" : value.get_str());
     }
     return result;
@@ -869,6 +866,12 @@ util::SettingsValue ArgsManager::GetSetting(const std::string& arg) const
         m_settings, m_network, SettingName(arg), !UseDefaultSection(arg), /* get_chain_name= */ false);
 }
 
+std::vector<util::SettingsValue> ArgsManager::GetSettingsList(const std::string& arg) const
+{
+    LOCK(cs_args);
+    return util::GetSettingsList(m_settings, m_network, SettingName(arg), !UseDefaultSection(arg));
+}
+
 bool RenameOver(fs::path src, fs::path dest)
 {
 #ifdef WIN32

src/util/system.h

@@ -180,6 +180,11 @@ protected:
      */
     util::SettingsValue GetSetting(const std::string& arg) const;
 
+    /**
+     * Get list of setting values.
+     */
+    std::vector<util::SettingsValue> GetSettingsList(const std::string& arg) const;
+
 public:
     ArgsManager();