Increase max character limit in target block

[PercyCreeper]

I've run into the issue that when reading certain data via a display link (in my case train station data), sometimes not all of the data is able to be read by a computer, as the target block has a set character limit and the read line is then cut to fit that size.

You could either make a config for the mod to allow for a higher maximum of characters, or you could just increase the limit some more.

[SammyForReal]

The target block really needs some improvements. Making the limit configurable within the API should be an improvement for now, until I have a more constant fix.