Add IPTV capabilities to the existing Digital TV UI

Extending the current interface for using it not only for DVB but also for IPTV.

Commits:
1- Add IPTV capabilities to the existing DVB UI
- Basic IPTV capabilities
- Navigation TV panel: tabbed filters for DVB-T, IPTV and Radio

2- Digital TV: adapting the channel management UI for IPTV:
- Channel Scan is now called Digital TV tools
- UI: new tab for managing IPTV channels
- IPTV: option for adding individual channels
- IPTV: option for importing a m3u list of channels
- New checkbox for removing existing channels when saving. Removes only the channels of the same type (DVB or IPTV)
- Adding channels: new counter for preventing having duplicate prefNumber channels

3- Digital TV: split options from analog capture and new Digital TV options

3.1. General
- Split menu entry into: Open Digital TV / Open Analog Capture. File->Open Device now only refers to analog device
- Split class OpenDeviceData into OpenDeviceAnalogData and OpenDeviceDigitalData
- Channel navigation panel: only enabled tabs visible (depending on Digital TV options). Set initial active tab depending on current channel type.
- Add IGMP membership management: manage IGMP group join/leave for multicast IPTV streaming sources. Supports only IPv4 and IGMPv2. IPv6 and IGMPv3 could be added in the future if needed.
- Add shortcut for Digital TV

3.2. Exception handling:
- error controls (checking devices, etc.) moved from the general entry point to each channel switch operation
- Change current behavior: when error switching to a channel -> show error message in info bar and then stay ready for switching to another channel
- If the IPTV switching channel operation fails, we don't change the window size

3.3. Options & preferences:
- Split Digital TV options from analog capture
- New Digital TV options: DVB (BDA) and IPTV (include option: enable/disable IGMP multicast membership management)


Pending issues and known limitations:
- ONLY English version: to be updated once it is ready for merge
- IPTV Channel management: additional options (scan range of IP's and service discovery for multicast) are in progress and will be included in a different PR. 
- Access to channel management from options menu: will be also included in a future PR.
I tend to avoid calling directly methods of another window class from within a windows class if possible. I prefer using messages for modularity in this case.

BTW this message WM_DTV_REFRESHSETTINGS is being used after changing options to force the player to refresh and apply the changes automatically. It might be updated to be used for other playback modes as well. If this was the case, may be the EventDispatcher would be meaningful. 

Please let me know how to proceed. I'll do whatever is decided here.