added fix "replace dot call with safe call" (from Sergey Ignatov)

idea/testData/quickfix/expressions/afterUnsafeCall.kt

@@ -0,0 +1,4 @@
+// "Replace with safe call" "true"
+fun foo(a: Int?) {
+    a?.plus(1)
+}

idea/testData/quickfix/expressions/beforeUnsafeCall.kt

@@ -0,0 +1,4 @@
+// "Replace with safe call" "true"
+fun foo(a: Int?) {
+    a<caret>.plus(1)
+}