Adjusted the protocol framework to support different types of falling block spawning.

In brief, with cProtocol, "say what you want done, not how you want me to do it".
But still 1.4.6 crashes on falling block spawning.

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1104 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/FallingBlock.cpp

@@ -32,7 +32,7 @@ void cFallingBlock::Initialize(cWorld * a_World)
 
 void cFallingBlock::SpawnOn(cClientHandle & a_ClientHandle)
 {
-	a_ClientHandle.SendSpawnObject(*this, 70, m_BlockType, 0, 0, 0, 0, 0);
+	a_ClientHandle.SendSpawnFallingBlock(*this);
 }