Update DynamicConfig.lua

Corrected typo in help text (/dynconfig -> /dynconf).

Added changing of particle density and view distance.
Added command to output current settings to chat window.

May want to look into having a time-since-combat check and only upscale graphics after a set amount of time to prevent spamming the changes too often (i.e. after 10 seconds OOC, apply high quality settings).