v2.19.0

* update to latest sdk
* update permissions usage
* update to AndroidFieldDB library
3.17.0-rc3

Registered as speech recognition system Using pocketsphinx kartuli sm…

…s language model

modifications added to use the Learnx app as a speech recognition tra…

…ining module (or flash cards)

new flow to swipe between datum/cards
new simplified layouts (one for flash cards, one for parallel texts/language learners)
new audio upload service to run the sphinx training pipelines on the server
other small improvements

screenshots: FieldDB#7

download, create, edit, delete datum; record audio, video, take pictu…

…res; register users