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Mojang created a brand new system (and library) for commands: https://github.com/Mojang/brigadier I don't know if there's a Forge wrapper for this library, but regardless the entire command system has changed.

There is an error in the config file of CodeChicken Lib. Check the config file (delete it if necessary).

Get over your fear of sending packets. The server is never aware of a "left-click empty" event - that's even mentioned in the javadoc for the PlayerInteractEvent.LeftClickEmpty event. Your only option if you want to inform the server is to listen for that event on the client and send a packet.

That's quite literally what readPixels is supposed to do - it reads the pixel values from the currently bound framebuffer. For the future you can read documentation about opengl methods here. For actually reading the pixel values from a texture you need to use getTexImage. Note that it will dump the entire texture onto the buffer though. You could render the part of the texture you need onto a framebuffer and read from that using readPixels but I don't think it is going to be faster than reading the entire texture.

This thread was a good read