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Merged libpng 1.6.2 from vendor branch. Updated pnglibconf.h to latest predefined config file to catch up with latest setup requirements.

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Third round of override macro updates. Should have touched all functions stating virtual for now. This might still have missed some, as sometimes the virtual keyword is missing on derived functions. And some open points are also still under consideration, will be fixed in future.

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Fix syntax problems in Cg renderer base classes, which came from the override changes. Not yet tested, but should compile again.

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Exposed some more functions:
getArchiveName returning name (path) of archive
getColor and getColorHSL for color select dialog
get/setDoubleClickTime in device for setting the time offset necessary to have two separate clicks instead of a double-click

Removed deprecated getXJoint and getMS3DJoint functions

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Some fixes:
Added get/setCurrentRenderPass to scene manager (internally renamed, exposed)
Removed destructor from light scene node.
Removed getType calls from archive loaders (one file archives have this)
Removed some internal exposures and virtual attributes for protected classes

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Add override patch by hende, to check for proper deriving in the class tree. Added MSVC support for this feature, should work beginning with MSVC 2010

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Another try to fix the compilation issues. Still untested, as my MSVC is currently out of business...

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Merged from 1.8 branch, revisions 4393-4484: Compiler issues with certain compilers fixed, localtime bug under windows7 fixed.

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- revert rotation patch from rev4478. Texture Matrix will be default solution for manipulate 2d image drawing.

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- Added support for rotation 2D images. This patch base on FuzzYspo0N patch from irrEXT. (Software drivers aren't supported).

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New method for camera scene nodes. updateMatrices updates the camera matrices without uploading them to the driver directly. Patch submitted by hendu

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