Remove dependency on KAPT

[cmelchior]

Closes #1513

Fixes the error in #1513, but it will just move the error to another. Most likely

> 'compileDebugJavaWithJavac' task (current target is 1.8) and 'compileDebugKotlinAndroid' task (current target is 17) jvm target compatibility should be set to the same Java version.
  Consider using JVM toolchain: https://kotl.in/gradle/jvm/toolchain

[clementetb]

LGTM Did you try setting up the JVM toolchain to see if it fixes issue too? It might prevent the JVM setup to fail.

https://kotl.in/gradle/jvm/toolchain

[cmelchior]

Yes, setting the toolchain in the Kotlin block fixes the issue, but it is not something we can do for people. They have to decide which java version to support. We should probably have it added to our documentation though.