[math] remove some unused or type specifc VECTx macros

find sw -path sw/airborne/math -prune -o -name "*.[ch]" -exec sed -ri 's/FLOAT_(VECT[23]_(ASSIGN|COPY|SMUL|DIFF|SUM|ADD|SUB|DOT_PRODUCT|CROSS_PRODUCT))/\1/g' {} +