libgphoto2 2.5.27 release

ptp2:
* report filesizes larger than 4GB correctly
* download files larger than 4GB
* empty ptp strings are reported as "", not as NULL
* report more MTP object properties
* Nikon
  * download of files larger than 4GB using getpartial object method
  * handle new application mode
  * handle new eventex fetcher on Z series
  * fixed movie on recent Z series
  * report liveview and movie prohibit conditions, as errors and also in configuration tree
  * some Nikon 1 V1 enhancements (the first camera of the 1 series is a bit special)
* report filesize > 4GB correctly, if possible
* Canon EOS:
  * EOS M6 Mark 2 is actually more like a EOS DSLR and fully capable, added some work
  * Handle OLCINFO for M6 Mark 2 and EOS R5 and new cameras
  * added current list of autoexposuremode to expose also Fv and friends
  * Canon Liveview size is encoded in "output" (PC / MOBILE / MOBILE2 variants are the different livesizes), try to expose seperately as "liveviewsize"
  * decode more options, nickname, eosmoviemode (color/bw), strobofiring, eventmode, flashcharged, oneshotrawon
  * bugfixes
* Sony Alpha:
  * report f-numbers enum with fixed list
  * fixed liveview taking on a new model
* Panasonic
  * implement liveviewsize
  * implement movie recording ( using --set-config movie=1/0 )
  * more doc and minor fixes
* ptp/ip: allow building on Windows
* New IDS:
  * Sony DSC-A7S III
  * Nikon Coolpix P1000, Z6_2, Z7_2 
  * Olympus E-M1 MII
  * Canon PowerShot G12, EOS M200
  * Fuji Fujifilm X-S10
  * Ricoh Theta V, Z1

canon:
* more shutterspeed reported

translations:
* updated french
