Fix the incorrect package-list location produced by Dokka (#580)

Fixes #268

Solution proposed by @adam-enko.
The approach is to use the multi-module configuration of Dokka,
and this change is a succinct way of doing that.

Author: dkhalanskyjb

core/build.gradle.kts

@@ -416,3 +416,7 @@ apiValidation {
         enabled = true
     }
 }
+
+dependencies {
+    dokka(project)
+}