Rename *CacheDriver to *Cache because they don't act as driver anymore

src/Core/Cache/IMemoryCache.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Friendica\Core\Cache;
+
+/**
+ * This interface defines methods for Memory-Caches only
+ *
+ * Interface IMemoryCache
+ *
+ * @package Friendica\Core\Cache
+ */
+interface IMemoryCache extends ICache
+{
+	/**
+	 * Sets a value if it's not already stored
+	 *
+	 * @param string $key      The cache key
+	 * @param mixed  $value    The old value we know from the cache
+	 * @param int    $ttl      The cache lifespan, must be one of the Cache constants
+	 * @return bool
+	 */
+	public function add($key, $value, $ttl = ICache::FIVE_MINUTES);
+
+	/**
+	 * Compares if the old value is set and sets the new value
+	 *
+	 * @param string $key         The cache key
+	 * @param mixed  $oldValue    The old value we know from the cache
+	 * @param mixed  $newValue    The new value we want to set
+	 * @param int    $ttl      	  The cache lifespan, must be one of the Cache constants
+	 *
+	 * @return bool
+	 */
+	public function compareSet($key, $oldValue, $newValue, $ttl = ICache::FIVE_MINUTES);
+
+	/**
+	 * Compares if the old value is set and removes it
+	 *
+	 * @param string $key          The cache key
+	 * @param mixed  $value        The old value we know and want to delete
+	 * @return bool
+	 */
+	public function compareDelete($key, $value);
+}