Add a set of new tests for KT-27075 (create expected class) + some fixes

idea/testData/multiModuleQuickFix/expectClassCommented/header/My.kt

@@ -0,0 +1,2 @@
+// My: to be implemented
+// DISABLE-ERRORS

idea/testData/multiModuleQuickFix/expectClassCommented/header/My.kt.after

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+// My: to be implemented
+// DISABLE-ERRORS
+/**
+ * Dokka comment: class to be created as expect
+ */
+expect class My {
+    fun foo(param: String): Int
+    fun String.bar(y: Double): Boolean
+    /**
+     * Dokka comment: Just does nothing
+     */
+    fun baz()
+
+    /**
+     * Dokka comment: Just does nothing
+     *
+     * @flag this parameter is just ignored
+     */
+    constructor(flag: Boolean)
+
+    val isGood: Boolean
+    var status: Int
+
+}

idea/testData/multiModuleQuickFix/expectClassCommented/jvm/My.kt

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+// "Create expected class in common module testModule_Common" "true"
+// DISABLE-ERRORS
+
+/**
+ * Dokka comment: class to be created as expect
+ */
+actual class <caret>My {
+    // Helpful function
+    actual fun foo(param: String): Int = 42
+
+    /* Very helpful extension */
+    actual fun String.bar(y: Double): Boolean = true
+
+    /**
+     * Dokka comment: Just does nothing
+     */
+    actual fun baz() {}
+
+    /**
+     * Dokka comment: Just does nothing
+     *
+     * @flag this parameter is just ignored
+     */
+    actual constructor(flag: Boolean) {}
+
+    // Some immutable property
+    actual val isGood: Boolean
+        get() = true
+
+    /* Interesting mutable property */
+    actual var status: Int
+        get() = 0
+        set(value) {}
+
+}

idea/testData/multiModuleQuickFix/expectClassCommented/jvm/My.kt.after

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+// "Create expected class in common module testModule_Common" "true"
+// DISABLE-ERRORS
+
+/**
+ * Dokka comment: class to be created as expect
+ */
+actual class <caret>My {
+    // Helpful function
+    actual fun foo(param: String): Int = 42
+
+    /* Very helpful extension */
+    actual fun String.bar(y: Double): Boolean = true
+
+    /**
+     * Dokka comment: Just does nothing
+     */
+    actual fun baz() {}
+
+    /**
+     * Dokka comment: Just does nothing
+     *
+     * @flag this parameter is just ignored
+     */
+    actual constructor(flag: Boolean) {}
+
+    // Some immutable property
+    actual val isGood: Boolean
+        get() = true
+
+    /* Interesting mutable property */
+    actual var status: Int
+        get() = 0
+        set(value) {}
+
+}