Moved radio configuration from Plugins to the TV section
- removed radio plugin's configuration form
- added a new radio client subsection to the TV section
- replaced all database accesses by new GetRadioChannelGroupNames() TvController interface call
- rearranged settings between the TV and the TV Client section
- all configuration sections use TV.hostname for TV server access
Beautifications and fine tuning
Hostname can now be selected
from a list of TV servers available in the loacal network.
The TV config sections are reordered and renamed
Revert "Merge remote-tracking branch 'remotes/upstream/FEAT-4263-Rework_TV_Radio_Configuration' into 1.3.0RC_SEB_ADDONV3_TV_TEST"

This reverts commit 6d6cd85e9139287a2f7873e2072b2c705c86b7c7, reversing
changes made to 3dcaa0dd83fce34687e0c15a0b73f4c8d5487752.
Merge remote-tracking branch 'remotes/upstream/FEAT-4263-Rework_TV_Radio_Configuration' into 1.3.0RC_SEB_ADDONV3_TV_TEST

Conflicts:
	mediaportal/Configuration/MediaPortal.Configuration.csproj
	mediaportal/Configuration/SettingsForm.cs