Implemented own version of LookupElementProximityWeigher (the standard one checks getObject() instanceof PsiElement)

#KT-8842 Fixed

idea/idea-completion/testData/weighers/basic/PreferFromJdk.Data.kt

@@ -0,0 +1,3 @@
+package dependency
+
+public class Data

idea/idea-completion/testData/weighers/basic/PreferFromJdk.kt

@@ -0,0 +1,7 @@
+import dependency.*
+import java.util.*
+
+fun foo(): Dat<caret>
+
+// ORDER: Date
+// ORDER: Data