Add inspection for suspicious 'var' property #KT-23691 Fixed

idea/testData/inspectionsLocal/suspiciousVarProperty/.inspection

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.inspections.SuspiciousVarPropertyInspection

idea/testData/inspectionsLocal/suspiciousVarProperty/hasBackingFieldRef.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+class Test {
+    <caret>var foo: Int = 0
+        get() = field
+}

idea/testData/inspectionsLocal/suspiciousVarProperty/hasBackingFieldRef2.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+class Test {
+    <caret>var foo: Int = 0
+        get() {
+            return field
+        }
+}

idea/testData/inspectionsLocal/suspiciousVarProperty/hasSetter.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+class Test {
+    <caret>var foo: Int
+        get() = 1
+        set(value) {
+        }
+}

idea/testData/inspectionsLocal/suspiciousVarProperty/noBackingFieldRef.kt

@@ -0,0 +1,5 @@
+// FIX: Change to val and delete initializer
+class Test {
+    <caret>var foo: Int = 0
+        get() = 1
+}

idea/testData/inspectionsLocal/suspiciousVarProperty/noBackingFieldRef.kt.after

@@ -0,0 +1,5 @@
+// FIX: Change to val and delete initializer
+class Test {
+    val foo: Int
+        get() = 1
+}