Mantis #4450: DRR 'default refresh rate' setting can be enabled without setting a value from the dropdown menu. Fix and Update DRR Value for GUI Setting to avoid a crash after clicking on default button setting.
- added some missing Audio Logos
Merge branch 'master' of github.com:MediaPortal/MediaPortal-1
- fixed issue with missing Exitmenu and Hiddentab in PluginsHome menu
Fix DRR 'default' button: Restore default table values and set default refreshrate to ATSCHD when it has no value
Merge remote-tracking branch 'remotes/upstream/BUG4450-DRR_default_refresh_rate_setting_can_be_enabled_without_setting_a_value_from_the_dropdown_menu' into 1.4.0Fork_SEB_New_Master

Conflicts:
	mediaportal/Configuration/Sections/GeneralDynamicRefreshRate.cs
	mediaportal/WindowPlugins/GUISettings/General/GeneralMP/GUISettingsGeneral_RefreshRate.cs
Merge remote-tracking branch 'remotes/upstream/master' into 1.4.0Fork_SEB_New_Master