fix: build.gradle & kotlinVersion

[NathanaelA]

Fix for Ticket 781

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Not sure if it was broken from a change in Gradle Versions; but the "BeforeEvaluate" function does NOT get called before the setting of the kotlinVersion in the top group. So any external properties set in gradle.properties are NOT set at the point we check for it. Copying the code to the top section in the initialize fixes the issue, additional tests will need to be done to see if we can just remove the beforeEvaluate section without any negative side effects. (So leaving that for now, as worst case is it re-assigns the same value to the same key).

[dev4s]

Hi @NathanaelA,
things that I see in the logs:

> Task :app:runSbg
org.json.JSONException: Expected a ',' or '}' at character 120
at org.json.JSONTokener.syntaxError(JSONTokener.java:410)
	at org.json.JSONObject.<init>(JSONObject.java:222)
	at org.json.JSONObject.<init>(JSONObject.java:402)
	at org.nativescript.staticbindinggenerator.Main.traverseDirectory(Main.java:163)
	at org.nativescript.staticbindinggenerator.Main.traverseDirectory(Main.java:193)
	at org.nativescript.staticbindinggenerator.Main.traverseDirectory(Main.java:193)
	at org.nativescript.staticbindinggenerator.Main.traverseDirectory(Main.java:193)
	at org.nativescript.staticbindinggenerator.Main.traverseDirectory(Main.java:193)
	at org.nativescript.staticbindinggenerator.Main.generateJsInputFile(Main.java:68)
	at org.nativescript.staticbindinggenerator.Main.main(Main.java:48)
Detailed log here: /home/travis/build/NativeScript/android-runtime/test-app/build-tools/runSbg.log

> Task :waitForUnitTestResultFile
Waiting for tests to finish...
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process is running
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process is running
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process is running
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process is running
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process is running
adb: error: remote object '/data/data/com.tns.testapplication/android_unit_test_results.xml' does not exist
com.tns.testapplication process died or never started!

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':runTestsAndVerifyResults'.