Rewrote shaders for GLSL 110 (openGL2.0).

[Szunti]

For poor guys with eg. old intel gma mobile gpus.

[itdelatrisu]

Thanks for the contribution! Just running a quick search through itdelatrisu.opsu.render, though, there are these GL30 calls in CurveRenderState.java:

• GL30.glBindFragDataLocation(program, 0, "out_colour");
• GL30.glGenerateMipmap(GL11.GL_TEXTURE_1D);

[Szunti]

Does it look better now?

out_colour variable was deleted in the GLSL110 version, so I deleted the glBindFragDataLocation call.
GenerateMipmapEXT is part of the EXTFramebufferobject extension, so I changed to that version.

[Szunti]

Actually I did care about checking the GL2+ things except for GenerateMipmap, where I thought it's not a tragedy if that fails.

The other line sneak in beacuse I edited the files before f0b87c9 and rebased the commit.

[itdelatrisu]

Other than removing the unused org.lwjgl.opengl.GL30 import, it looks fine to me, but I'll leave this open for a day or so in case anyone else has comments (since I still know nothing about OpenGL :P). Thanks again!