Lets not do the last two commits just before 5.11

Revert "change several strcat calls to Q_strlcat calls"
This reverts commit ab879f1bc7666d0076d42217eeafdd622a1c3fd0.

Revert "change (v)sprintf calls to (v)snprintf calls"
This reverts commit b46e210d76c3456ab7df4620a97e3702cdc7a4da.
cleanup Com_sprintf, minor tuning