Filesystem handling is now more flexible

- removed CResourceLoader class in favor of one that implements resource loader interface
- removed global pool of files, in favour of more dynamic approach
- renamed some files to match current situation
All these changes are needed mostly for future mod manager + .zip support

lib/filesystem/CInputStream.h

@@ -1,3 +1,4 @@
+#pragma once
 
 /*
  * CInputStream.h, part of VCMI engine
@@ -9,8 +10,6 @@
  *
  */
 
-#pragma once
-
 /**
  * Abstract class which provides method definitions for reading from a stream.
  */
@@ -62,7 +61,17 @@ public:
 	virtual si64 getSize() = 0;
 
 	/**
-	 * Closes the stream and releases any system resources associated with the stream explicitely.
+	 * @brief for convenience, reads whole stream at once
+	 *
+	 * @return pair, first = raw data, second = size of data
 	 */
-	//virtual void close() = 0;
+	std::pair<std::unique_ptr<ui8[]>, size_t> readAll()
+	{
+		std::unique_ptr<ui8[]> data(new ui8[getSize()]);
+
+		size_t readSize = read(data.get(), getSize());
+		assert(readSize == getSize());
+
+		return std::make_pair(std::move(data), getSize());
+	}
 };