CIDR: Better detection when running in CIDR-based IDE

- Drop unnecessary bunch files for `KotlinFacetType` and `KotlinFacetTypeImpl`
- Use cached val `isRunningInCidrIde` to check if the code is running under CIDR

idea/ide-common/src/org/jetbrains/kotlin/idea/util/cidrUtil.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+@file:JvmName("CidrUtil")
+
+package org.jetbrains.kotlin.idea.util
+
+import com.intellij.util.PlatformUtils
+
+val isRunningInCidrIde by lazy { PlatformUtils.isCidr() }