Add watching to resources folder

orx-olive/src/main/kotlin/Resources.kt

@@ -0,0 +1,29 @@
+package org.openrndr.extra.olive
+
+import java.io.File
+
+class Resources(val filterOutExtensions: List<String> = listOf()) {
+    private val watchedResources = mutableMapOf<File, Boolean>()
+
+    fun watch(src: File, watchFn: (file: File) -> Unit) {
+        src.listFiles()!!.forEach {file ->
+            if (file.isFile && !filterOutExtensions.contains(file.extension)) {
+                watchedResources[file] = false
+
+                watchFn(file)
+            } else if (file.isDirectory) {
+                watch(file, watchFn)
+            }
+        }
+    }
+
+    operator fun get(file: File): Boolean? {
+        return watchedResources[file]
+    }
+
+    operator fun set(file: File, value: Boolean) {
+        if (watchedResources.containsKey(file)) {
+            watchedResources[file] = value
+        }
+    }
+}