* Add support for drawing batched 3D lines of arbitrary color and thickness.
* Add draw3dLine lua function.
* Move line texture out of graphics.h into graphics.cpp, also rename it for proper code style.
* Move line texture generation to batching.cpp, create dedicated batching_add_line function and add support for a line with variable thickness at the start and end.
* Use references in the verts loop
* Add bound checks for line widths
* Warn if the Lua script uses invalid widths
Kiloku
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