Merged from branch 1.7, revisions 3607-3725. Fix some compilation errors, fix soname in Linux Makefile, calculation fix in vector2d class, CGUIScrollBar event handling fix.

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Fix png loader warning, also reordered transform calls such that only one test requires a late place after the read_update call. Added a test case which tests paletted png file loading and rendering.

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Change type for stored and passed lights array. In most situations, only the ISceneNode was used, and the type is not necessarily ILightSceneNode anyway. So generalize this interface and the storage arrays internally.

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Add proper compile time define for enabling usage of direct input joystick support (enabled by default)

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Add triangle selector methods to get back single selectors from meta triangle selector. Submitted by LexManos

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The code needs to be cleaned up a little more. But it seems to work properly and is the preferred solution according to MSDN. Both solutions will be kept in the code, the choice define will be moved to IrrCompileConfig later.

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Added scaling draw2dimage method to burnings video. This fix is based on code submission from Auria.

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Fix some problems with gimbal lock in quaternion to Euler method. Not yet completely going through the test, I guess it's a euler order problem.

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Check if low-level texture for RTT was created, otherwise return nullptr to signal failure in RTT creation. Thanks to stefbuet for pointing out this problem.

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Added a test case for 2d filtering, provided by Auria from STK team. Fixed a bug in the OpenGL render settings.

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