Veil Wallet 1.0.19

Full Changelog: v1.0.17...v1.0.19

Wallet app changes:

• added ability to change conversion API url
• added ability to set conversion rate manually
• back button support on Android
• removed nonkyc referral link

Repository changes:

• android builds is now additionally produced with splitted ABI apks
• github workflow for android is now match F-Droid build workflow to produce reproducible builds
• updated referenced workflows
• added images to README.md
• added donate section
• added light wallet website link (do not confuse with the official veil project website)