Invert if condition intention: don't add unnecessary 'continue'

#KT-12329 Fixed

idea/testData/intentions/invertIfCondition/unnecessaryContinue.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        <caret>if (x == 'a') continue
+        println("else")
+    }
+}

idea/testData/intentions/invertIfCondition/unnecessaryContinue.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        if (x != 'a') {
+            println("else")
+        }
+    }
+}

idea/testData/intentions/invertIfCondition/unnecessaryContinue2.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        if (x != 'a') {
+            <caret>if (x == 'b') continue
+            println("else")
+        }
+    }
+}

idea/testData/intentions/invertIfCondition/unnecessaryContinue2.kt.after

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        if (x != 'a') {
+            if (x != 'b') {
+                println("else")
+            }
+        }
+    }
+}

idea/testData/intentions/invertIfCondition/unnecessaryContinue3.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        if (x != 'a') {
+            <caret>if (x == 'b') {
+                println("foo")
+                continue
+            }
+            println("else")
+        }
+    }
+}

idea/testData/intentions/invertIfCondition/unnecessaryContinue3.kt.after

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+fun test() {
+    for (x in "abc") {
+        if (x != 'a') {
+            if (x != 'b') {
+                println("else")
+                continue
+            }
+            println("foo")
+        }
+    }
+}