renderer: code cosmetics
qcommon: code cosmetics common.c
renderer: fixed q3 bug of never used cvar values for r_maxpolyverts and
r_maxpolys (did always use MAXED values see old R_Init for lower
values), added some prints when max values are reached ,fixed several
potential buffer overflows related to above cvars (thx Ensiform for your
inspiring commit in OJK), note: both cvars are
now of type latched 

FIXME: sync renderer2 code!