1.5.6: Upgrade dependencies, Remove outdated (#47)

* * Upgrade Kotlin 1.5.31 -> 1.6.21

* Upgrade Grade Build Tool 4.0.0 -> 7.2.1
* Upgrade Gradle 6.1.1 -> 7.4.2
* sourceCompatibility/targetCompatibility Java 8 -> Java 11
* (sample) app module depends on library module directly instead of using Jitpack
* Upgrade all dependencies
- Remove jcenter()

* + CHANGELOG.md

* + ViewBinding
- Kotlin Android Extensions

* * Fix trustwallet-core dep. version

* * Update CHANGELOG.md

Co-authored-by: Viacheslav Kulish <32914239+vcoolish@users.noreply.github.com>