This increases the maximum chat width from 150 to 300 (a little less than entire screen), because currently even the maximum width feels ridiculously cramped, to the point I find the old chat easier to read.
Also this makes the default width 150 instead of 128.
And while I'm at it, I made a few very minor cleanup in the chat code,
like removing malloc calls for fixed-size strings and C has .min() and max() yes yes