Apply rri/yole/modularize, create gradle run configuration for IDEA

buildSrc/src/main/kotlin/dependencies.kt

@@ -81,3 +81,11 @@ private fun String.toMaybeVersionedJarRegex(): Regex {
     return Regex(if (hasJarExtension) escaped else "$escaped(-\\d.*)?\\.jar") // TODO: consider more precise version part of the regex
 }
 
+
+private val jreHome = System.getProperty("java.home")
+
+fun firstFromJavaHomeThatExists(vararg paths: String): File =
+        paths.mapNotNull { File(jreHome, it).takeIf { it.exists() } }.firstOrNull()
+                ?: throw GradleException("Cannot find under '$jreHome' neither of: ${paths.joinToString()}")
+
+fun toolsJar(): File = firstFromJavaHomeThatExists("../lib/tools.jar", "../Classes/tools.jar")