libgphoto2 2.5.25 release

ptp2:
* Liveview support for Leica SL
* PTP 1.1 Streaming parameters added. 
* Olympus OMD capture fixes
* Nikon DSLR/Z:
  * various improvements to liveview error reporting.
  * much more properties added, some values added
  * allow downloading of "large thumbnails" instead of "regular thumbnails",
    can be selected by "thumbsize" gphoto2 local setting.
  * fixes for D3000, D3100 methods
  * maximum capture wait extended to 1000 seconds (as the D870 has 900 seconds max now)
* Canon EOS
  * initialization fixes (if it breaks your EOS M or PowerShot, please report)
  * liveview enablement fixed
  * maximum capture wait extended to 90seconds
  * EOS R shutterspeed , aperture reporting fixed
* various bugfixes
* Cameras added to id list:
  * Sony NEX 5
  * Canon EOS 90D
  * Fuji XT-4
  * Sanyo VPC-FH1
  * Leica SL Typ 601

lumix:
* fixed initialisation, might help capture

all:
* ongoing stability fixes from AFL fuzzing

translation updates:
* sv
