New OE2.5 Update -21.02.2017​

Update: ennigma2 4.3.0r28
- fixed CIFS/Samba recordings again (broken since 4.3.0r27)
- fixed broken keyboard textfield input (broken since 4.3.0r27)
- prefer SVG instead of PNG graphics for menu
- skin_default: dropped duplicated ChannelSelection_summary for Color OLED (where the broken one was actually active)
- splitted up browser user-agent into browserUserAgent, hbbtvUserAgent and mediaRecvUserAgent and allow to change them from python
- added support for per service user-agent and extra headers in path part of servicereference strings