Build: move buildscripts & versions from root directory to ./gradle

javaInstrumentation.gradle.kts
report.gradle.kts
versions.gradle.kts
and all versions.properties

gradle/versions.gradle.kts

@@ -0,0 +1,50 @@
+import java.util.*
+import java.io.*
+
+var propertiesFile: File = rootProject.file("gradle/versions.properties")
+if (!propertiesFile.exists()) {
+    //work-around for buildSrc
+    propertiesFile = rootProject.file("../gradle/versions.properties")
+}
+
+FileReader(propertiesFile).use {
+    val properties = Properties()
+    properties.load(it)
+    properties.forEach { (k, v) ->
+        extra[k.toString()] = v
+    }
+}
+
+val gradleJars = listOf(
+    "gradle-api",
+    "gradle-tooling-api",
+    "gradle-base-services",
+    "gradle-wrapper",
+    "gradle-core",
+    "gradle-base-services-groovy"
+)
+
+val androidStudioVersion = if (extra.has("versions.androidStudioRelease"))
+    extra["versions.androidStudioRelease"]?.toString()?.replace(".", "")?.substring(0, 2)
+else
+    null
+
+val intellijVersion = rootProject.extra["versions.intellijSdk"] as String
+val intellijVersionDelimiterIndex = intellijVersion.indexOfAny(charArrayOf('.', '-'))
+if (intellijVersionDelimiterIndex == -1) {
+    error("Invalid IDEA version $intellijVersion")
+}
+
+val platformBaseVersion = intellijVersion.substring(0, intellijVersionDelimiterIndex)
+val platform = androidStudioVersion?.let { "AS$it" } ?: platformBaseVersion
+
+rootProject.extra["versions.platform"] = platform
+
+
+for (jar in gradleJars) {
+    extra["versions.jar.$jar"] = extra["versions.gradle-api"]
+}
+
+if (!extra.has("versions.androidStudioRelease")) {
+    extra["ignore.jar.android-base-common"] = true
+}