Better spell check dictionary

[Trimoor]

The spell check is great, but it catches far too many valid technical and arcade terms.  It would be great if the moderators were allowed to add words to the dictionary while spell checking, but this might be beyond the abilities of the board program.  In that case, I think we should compile a list of the most common terms used here, and add them to the dictionary.

I'll start.
LEDs CP IPAC Happ MDF Wico