settings: introduce sub-settings through ISubSettings
CPlayerCoreFactory: implement ISubSettings
settings: move skin settings into CSkinSettings
settings: move source settings into CMediaSourceSettings
settings: move view state settings into CViewStateSettings
CAdvancedSettings: implement ISubSettings
CApplication: implement ISubSettings
settings: move application settings into CApplicationSettings
settings: move media settings into CMediaSettings
settings: move rss settings into CRssManager
[win32] update VS project files