initial version for LibreELEC

• add Astrometa DVB-T2 firmwares
• add Delock 61959 DVB-C/T firmware
• add DVBSky DVBSKY S952v3 firmware
• update Afatech firmware to fixes various problems for some af90xx
• update ds3103 firmware (unclear version)
• update Pinnacle PCTV (460e) firmware to 1.27.43.0
• update Si2158-A20 firmware to 2.0.35
• update Si2168-A20 firmware (unclear version)
• update Si2168-A30 firmware (unclear version)
• update Si2168-B40 firmware to 4.0.11