Add @JvmStatic Intention: Support functions/properties in objects

Also eliminate unnecessary object instance references on Java call sites

 #KT-20095 Fixed

idea/testData/multiFileIntentions/addJvmStaticToCompanionObjectFun/addJvmStaticToCompanionObjectFun.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "test/test.kt",
+  "intentionClass": "org.jetbrains.kotlin.idea.intentions.AddJvmStaticIntention",
+  "withRuntime": "true"
+}

idea/testData/multiFileIntentions/addJvmStaticToCompanionObjectFun/after/test/J.java

@@ -0,0 +1,8 @@
+package test;
+
+class J {
+    void test(C.Companion companion) {
+        companion.foo("x");
+        C.foo("y");
+    }
+}

idea/testData/multiFileIntentions/addJvmStaticToCompanionObjectFun/after/test/test.kt

@@ -0,0 +1,8 @@
+package test
+
+class C {
+    companion object {
+        @JvmStatic
+        fun foo(s: String) {}
+    }
+}

idea/testData/multiFileIntentions/addJvmStaticToCompanionObjectFun/before/test/J.java

@@ -0,0 +1,8 @@
+package test;
+
+class J {
+    void test(C.Companion companion) {
+        companion.foo("x");
+        C.Companion.foo("y");
+    }
+}

idea/testData/multiFileIntentions/addJvmStaticToCompanionObjectFun/before/test/test.kt

@@ -0,0 +1,7 @@
+package test
+
+class C {
+    companion object {
+        fun <caret>foo(s: String) {}
+    }
+}