3D Physics Rework, Other Stuff

-=-=-=-=-=-=-=-=-=-=-=-=-=-

3D Physics:
-Fixed "Bounce" parameter in 3D
-Fixed bug affecting Area (sometims it would not detect properly)
-Vehicle Body has seen heavy work
-Added Query API for doing space queries in 3D. Needs some docs though.
-Added JOINTS! Adapted Bullet Joints: and created easy gizmos for setting them up:
   -PinJoint
   -HingeJoint (with motor)
   -SliderJoint
   -ConeTwistJoint
   -Generic6DOFJoint
-Added OBJECT PICKING! based on the new query API. Any physics object now (Area or Body) has the following signals and virtual functions:
    -input_event (mouse or multitouch input over the body)
    -mouse_enter (mouse entered the body area)
    -mouse_exit (mouse exited body area)
   For Area it needs to be activated manually, as it isn't by default (ray goes thru).

Other:

-Begun working on Windows 8 (RT) port. Compiles but does not work yet.
-Added TheoraPlayer library for improved to-texture and portable video support.
-Fixed a few bugs in the renderer, collada importer, collada exporter, etc.

modules/gdscript/gd_tokenizer.cpp

@@ -95,6 +95,7 @@ const char* GDTokenizer::token_names[TK_MAX]={
 "var",
 "preload",
 "assert",
+"yield",
 "'['",
 "']'",
 "'{'",
@@ -826,6 +827,7 @@ void GDTokenizerText::_advance() {
 								{TK_PR_VAR,"var"},
 								{TK_PR_PRELOAD,"preload"},
 								{TK_PR_ASSERT,"assert"},
+								{TK_PR_YIELD,"yield"},
 								{TK_PR_CONST,"const"},
 								//controlflow
 								{TK_CF_IF,"if"},
@@ -1006,7 +1008,7 @@ void GDTokenizerText::advance(int p_amount) {
 
 //////////////////////////////////////////////////////////////////////////////////////////////////////
 
-#define BYTECODE_VERSION 1
+#define BYTECODE_VERSION 2
 
 Error GDTokenizerBuffer::set_code_buffer(const Vector<uint8_t> & p_buffer) {
 
@@ -1016,8 +1018,8 @@ Error GDTokenizerBuffer::set_code_buffer(const Vector<uint8_t> & p_buffer) {
 	ERR_FAIL_COND_V( p_buffer.size()<24 || p_buffer[0]!='G' || p_buffer[1]!='D' || p_buffer[2]!='S' || p_buffer[3]!='C',ERR_INVALID_DATA);
 	
 	int version = decode_uint32(&buf[4]);
-	if (version>1) {
-		ERR_EXPLAIN("Bytecode is too New!");
+	if (version>BYTECODE_VERSION) {
+		ERR_EXPLAIN("Bytecode is too New! Please use a newer engine version.");
 		ERR_FAIL_COND_V(version>BYTECODE_VERSION,ERR_INVALID_DATA);
 	}
 	int identifier_count = decode_uint32(&buf[8]);