Move resources from /src to separate /resources directory.

Previously this files was stored in /src directory and was included in
resources mainly by SourceSet.projectDefault from sourceSets.kt:

val processResources = tasks.getByName(processResourcesTaskName) as ProcessResources
processResources.from("resources") { include("**") }
processResources.from("src") { include("META-INF/**", "**/*.properties") }

Also there are some custom rules like this:

resources.srcDir("../idea-analysis/src").apply { include("**/*.properties") }
resources.srcDirs("idea-repl/src").apply { include("META-INF/**") }

All this rules are synthesized in script
https://github.com/snrostov/kotlin-migrate-resources/blob/master/src/main/kotlin/main.kt

This commit created using that script. See README.md for more details on
 script.

idea/resources/META-INF/injection.xml

@@ -0,0 +1,13 @@
+<idea-plugin>
+    <extensions defaultExtensionNs="com.intellij">
+        <multiHostInjector implementation="org.jetbrains.kotlin.idea.injection.KotlinLanguageInjector" order="first,before TemporaryPlacesInjector"/>
+
+        <regExpLanguageHost forClass="org.jetbrains.kotlin.psi.KtStringTemplateExpression"
+                            implementationClass="com.intellij.psi.impl.JavaRegExpHost"/>
+    </extensions>
+
+    <extensions defaultExtensionNs="org.intellij.intelliLang">
+        <languageSupport implementation="org.jetbrains.kotlin.idea.injection.KotlinLanguageInjectionSupport"/>
+        <injectionConfig config="injection/kotlinInjections.xml"/>
+    </extensions>
+</idea-plugin>