Migration to AndroidX
- Update to API level 29
- Update Java sourcecode and xml import statements
- Upgrade Butterknife Version 10 AndroidX support
- Set Java 8 compile options due Butterknife needs it
* Target Sdk Version 26
* Add Adaptive Icon For API 26+
* Update travis to compile against API 26
* Move SVG files to art/launcher/v26/ per CR
* Scale logo to 83%
* Update buildToolsVersion to 26.0.2
* Update travis build-tools to 26.0.2