Fixed a bug in MeshNode2T that would permanently change the depth comparison function instead of only temporarily

Changed scenegraph nodes to use new GLState getter/setter for depth comparison function

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Moved depth_func_ from BaseNode to GL_State since most nodes don't use this. Therefore some object nodes had to be updated to reflect this.

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Moved depth_func_ from BaseNode to GL_State since most nodes don't use this. Updated all nodes to reflect this, especially LineNode which can now be set to be "always on top" as is desired by the lasso selection.

Fixed a crash in Lasso Selection that would occur if the line was not properly closed.

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Remove all children from additional node when deleting the subtree(otherwise we get dangling pointers)

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Added entry in global rendering menu to globally set mipmapping
Fixed a few documentation typos

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Fixed small bug in menu bar (orthogonal/perspective projection option)
Renaming to diversify between examiner and viewer snapshot functions; this is also reflected in the menu

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* normal computation


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