roll forward dependency versions; externalise some dep versions

[micolous]

Update some dependencies, and make versioning consistent again:

• Kotlin 1.3.11 (jvmcli) / 1.3.41 (others) ▶️ 1.3.50 1.3.41 (consistently)
• Android Gradle Plugin 3.2.1 (jvmcli) / 3.4.1 (others) ▶️ 3.4.1 (consistently)
• Protobuf 3.0.1 ▶️ 3.9.1 (consistently); switched to new JavaLite configuration style used in Protobuf 3.8.0+
• Protobuf Gradle Plugin 0.8.6 (jvmcli) / 0.8.8 (others) ▶️ 0.8.10 (consistently)

Removes duplicated definitions of buildscript.ext in jvmcli/build.gradle.

Some stuff here is still behind the current version -- the key things I was going for was making jvmcli/build.gradle consistent, and getting one of the illegal reflective access issues fixed (as seen here).

[micolous]

Looks like the new protobuf library has a compatibility issue on API <= 23: https://travis-ci.org/metrodroid/metrodroid/jobs/588019272#L1622-L1714

[micolous]

Ah, protobuf bug is protocolbuffers/protobuf#6551

[phcoder]

Please test it on iOS. I had some problems with kotlin 1.3.50 there

[micolous]

Yup, I see the error. :(

> Task :cinteropStationsIOS FAILED
w: skipping ~/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-io-iosx64/0.1.9-1.3.40-eap-67/a56936f6af82195286e22098ba1ac88d78d77d10/kotlinx-io.klib. The abi versions don't match. Expected '[14]', found '9'
w: The compiler versions don't match either. Expected '[]', found '1.3-eap-10415'
e: Could not find "~/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-io-iosx64/0.1.9-1.3.40-eap-67/a56936f6af82195286e22098ba1ac88d78d77d10/kotlinx-io.klib" in [~/metrodroid, ~/.konan/klib, ~/.konan/kotlin-native-macos-1.3.50/klib/common, ~/.konan/kotlin-native-macos-1.3.50/klib/platform/ios_x64].

[micolous]

I've rolled it back to Kotlin 1.3.41. This is now the same version as was used on iOS before, but still rolls forward jvmcli.

This still means that IOS version will have a newer protoc in use; but should now actually match the version pulled in the submodule. Still waiting for a build to complete locally for IOS.