simplify size calculation
simplify size calculation

add "moduleSize" calculator, add multiply and overhead helper

rlugojr/webpack,SimenB/webpack,rlugojr/webpack,SimenB/webpack,webpack/webpack,EliteScientist/webpack,jescalan/webpack,jescalan/webpack,rlugojr/webpack,SimenB/webpack,ts-webpack/webpack,webpack/webpack,NekR/webpack,webpack/webpack,g0ddish/webpack,NekR/webpack,EliteScientist/webpack,ts-webpack/webpack,g0ddish/webpack,ts-webpack/webpack,jescalan/webpack,g0ddish/webpack,webpack/webpack,ts-webpack/webpack,SimenB/webpack