Java to Kotlin converter: big refactoring of code generation to never allow end of line comments to stick together with further code

#KT-4421 Fixed

j2k/tests/testData/ast/comments/fieldWithEndOfLineComment.java

@@ -0,0 +1,4 @@
+//file
+class A {
+    private boolean isOpen = true; // ideally should be atomic boolean
+}

j2k/tests/testData/ast/comments/fieldWithEndOfLineComment.kt

@@ -0,0 +1,3 @@
+class A() {
+    private var isOpen: Boolean = true // ideally should be atomic boolean
+}

j2k/tests/testData/ast/comments/fieldsInitializedFromParams.java

@@ -0,0 +1,17 @@
+//file
+class C {
+    private final int p1; // field p1
+
+    /**
+     * Field myP2
+     */
+    private final int myP2;
+
+    /* Field p3 */ public int p3;
+
+    public C(int p1 /* parameter p1 */, int p2, int p3) {
+        this.p1 = p1;
+        myP2 = p2;
+        this.p3 = p3;
+    }
+}

j2k/tests/testData/ast/comments/fieldsInitializedFromParams.kt

@@ -0,0 +1,6 @@
+class C(private val p1: Int /* parameter p1 */ // field p1
+        ,
+        /**
+         * Field myP2
+         */
+        private val myP2: Int, /* Field p3 */ public var p3: Int)