Fix IDE warnings and make some methods static

Julien LepillerSat Jun 06 19:33:58+0200 2020

7f932b9

nani/app/fastlane/metadata/android/en-US/images
namelast commitdate
featureGraphic.pngAdd images for fdroid pageSat Jun 06 00:15:05+0200 2020
phoneScreenshots/Add images for fdroid pageSat Jun 06 00:15:05+0200 2020