Added more quickfixes; added tests

idea/testData/quickfix/expressions/afterUnnecessarySafeCall1.kt

@@ -0,0 +1,4 @@
+// "Replace to dot call" "true"
+fun foo(a: Any) {
+    <caret>a.equals(0)
+}

idea/testData/quickfix/expressions/afterUnnecessarySafeCall2.kt

@@ -0,0 +1,7 @@
+// "Replace to dot call" "true"
+fun foo(a: Any) {
+    when (a) {
+        .equals(0) => true
+        else => false
+    }
+}

idea/testData/quickfix/expressions/afterUselessCast.kt

@@ -0,0 +1,4 @@
+// "Replace a cast with a static assert" "true"
+fun foo(a: String) {
+    val b = a : Any
+}

idea/testData/quickfix/expressions/afterUselessCastStaticAssertIsFine.kt

@@ -0,0 +1,4 @@
+// "Remove cast" "true"
+fun foo(a: Any) {
+    val b = a<caret>
+}

idea/testData/quickfix/expressions/afterUselessElvis.kt

@@ -0,0 +1,4 @@
+// "Remove elvis operator" "true"
+fun foo(a: String) {
+    val b : String = <caret>a
+}

idea/testData/quickfix/expressions/beforeUnnecessarySafeCall1.kt

@@ -0,0 +1,4 @@
+// "Replace to dot call" "true"
+fun foo(a: Any) {
+    a<caret>?.equals(0)
+}

idea/testData/quickfix/expressions/beforeUnnecessarySafeCall2.kt

@@ -0,0 +1,7 @@
+// "Replace to dot call" "true"
+fun foo(a: Any) {
+    when (a) {
+        <caret>?.equals(0) => true
+        else => false
+    }
+}

idea/testData/quickfix/expressions/beforeUselessCast.kt

@@ -0,0 +1,4 @@
+// "Replace a cast with a static assert" "true"
+fun foo(a: String) {
+    val b = a <caret>as Any
+}

idea/testData/quickfix/expressions/beforeUselessCastStaticAssertIsFine.kt

@@ -0,0 +1,4 @@
+// "Remove cast" "true"
+fun foo(a: Any) {
+    val b = a <caret>as Any
+}

idea/testData/quickfix/expressions/beforeUselessElvis.kt

@@ -0,0 +1,4 @@
+// "Remove elvis operator" "true"
+fun foo(a: String) {
+    val b : String = <caret>a ?: "s"
+}