API BREAKER: Replacing defines in irrTypes.h which are conflicting with c++ reserved identifier rules.

C++ has undefined behavior for identifiers starting with __ or with _ followed by an uppercase letter.
We still have many more (in IrrCompileConfig.h and in all header-guards), will likely replace those later as well.
As a workaround for users which might use irrlicht defines in their code, I've added the header irrLegacyDefines.h
Including that allows to continue using old defines for a while - or make it easier to have code which compiles 
with old and new Irrlicht library versions.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6251 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IImage.h

@@ -190,7 +190,7 @@ public:
 	depends on the color format of the image. For example if the color
 	format is ECF_A8R8G8B8, it is of u32. Be sure to call unlock() after
 	you don't need the pointer any more. */
-	_IRR_DEPRECATED_ void* lock()
+	IRR_DEPRECATED void* lock()
 	{
 		return getData();
 	}
@@ -198,7 +198,7 @@ public:
 	//! Unlock function.
 	/** Should be called after the pointer received by lock() is not
 	needed anymore. */
-	_IRR_DEPRECATED_ void unlock()
+	IRR_DEPRECATED void unlock()
 	{
 	}
 
@@ -363,14 +363,14 @@ public:
 	virtual void fill(const SColor &color) =0;
 
 	//! Inform whether the image is compressed
-	_IRR_DEPRECATED_ bool isCompressed() const
+	IRR_DEPRECATED bool isCompressed() const
 	{
 		return IImage::isCompressedFormat(Format);
 	}
 
 	//! Check whether the image has MipMaps
 	/** \return True if image has MipMaps, else false. */
-	_IRR_DEPRECATED_ bool hasMipMaps() const
+	IRR_DEPRECATED bool hasMipMaps() const
 	{
 		return (getMipMapsData() != 0);
 	}