- KT-1756 Filter invisible members from the first completion list

- Analyze is reference variant is suitable for completion before creating LookupElement
- Show visibility icon in completion list for kotlin declarations

 #KT-1756 fixed

idea/testData/completion/basic/VisibilityClassMembersFromExternalForce.kt

@@ -0,0 +1,13 @@
+class Some() {
+    public val testPublic = 12
+    protected val testProtected = 12
+    private val testPrivate = 12
+    val testPackage = 12
+}
+
+fun test() {
+    Some().<caret>
+}
+
+// TIME: 2
+// EXIST: testPublic, testProtected, testPrivate, testPackage