replaced var with let in system.nim
replaced var with let in system.nim

Nitpicking.
bvssvni/Nim,dom96/Nim,tmm1/Nim,douglas-larocca/Nim,xland/Nim,gokr/Nim,douglas-larocca/Nim,kirbyfan64/Nim,MrJohz/Nim,sarvex/Nim-lang,msmith491/Nim,sferik/Nim,sarvex/Nim-lang,sarvex/Nim-lang,judofyr/Nim,SSPkrolik/Nim,Salafit/Nim,Matt14916/Nim,jfhg/Nim,fredericksilva/Nim,nanoant/Nim,endragor/Nim,MrJohz/Nim,JCavallo/Nim,sferik/Nim,SSPkrolik/Nim,msmith491/Nim,russpowers/Nim,xland/Nim,BlaXpirit/nim,haiodo/Nim,Senketsu/Nim,SSPkrolik/Nim,msmith491/Nim,Salafit/Nim,judofyr/Nim,Senketsu/Nim,douglas-larocca/Nim,reactormonk/nim,mbaulch/Nim,endragor/Nim,fredericksilva/Nim,greyanubis/Nim,sarvex/Nim-lang,nafsaka/Nim,douglas-larocca/Nim,BlaXpirit/nim,zachaysan/Nim,Salafit/Nim,tulayang/Nim,mbaulch/Nim,endragor/Nim,xland/Nim,tulayang/Nim,reactormonk/nim,msmith491/Nim,tulayang/Nim,Dhertz/Nim,Senketsu/Nim,Matt14916/Nim,mbaulch/Nim,JCavallo/Nim,reactormonk/nim,tmm1/Nim,msmith491/Nim,douglas-larocca/Nim,reactormonk/nim,haiodo/Nim,russpowers/Nim,singularperturbation/Nim,fredericksilva/Nim,nimLuckyBull/Nim,Salafit/Nim,fredericksilva/Nim,dom96/Nim,judofyr/Nim,endragor/Nim,Senketsu/Nim,reactormonk/nim,haiodo/Nim,sarvex/Nim-lang,endragor/Nim,reactormonk/nim,tulayang/Nim,greyanubis/Nim,dom96/Nim,MrJohz/Nim,SSPkrolik/Nim,russpowers/Nim,jsanjuas/Nim,tmm1/Nim,kirbyfan64/Nim,xland/Nim,bvssvni/Nim,MrJohz/Nim,Dhertz/Nim,BlaXpirit/nim,jsanjuas/Nim,fredericksilva/Nim,bvssvni/Nim,sarvex/Nim-lang,SSPkrolik/Nim,fmamud/Nim,zachaysan/Nim,nafsaka/Nim,singularperturbation/Nim,tmm1/Nim,jfhg/Nim,fredericksilva/Nim,nafsaka/Nim,greyanubis/Nim,Senketsu/Nim,jsanjuas/Nim,gokr/Nim,Dhertz/Nim,zachaysan/Nim,kirbyfan64/Nim,kirbyfan64/Nim,jsanjuas/Nim,bvssvni/Nim,nimLuckyBull/Nim,nafsaka/Nim,zachaysan/Nim,Senketsu/Nim,Dhertz/Nim,JCavallo/Nim,jsanjuas/Nim,msmith491/Nim,sarvex/Nim-lang,dom96/Nim,judofyr/Nim,tulayang/Nim,reactormonk/nim,nafsaka/Nim,gokr/Nim,JCavallo/Nim,fmamud/Nim,nimLuckyBull/Nim,MrJohz/Nim,jfhg/Nim,Matt14916/Nim,dom96/Nim,Matt14916/Nim,nimLuckyBull/Nim,endragor/Nim,judofyr/Nim,JCavallo/Nim,russpowers/Nim,fmamud/Nim,jfhg/Nim,greyanubis/Nim,nanoant/Nim,jfhg/Nim,bvssvni/Nim,jsanjuas/Nim,Senketsu/Nim,haiodo/Nim,haiodo/Nim,nanoant/Nim,sferik/Nim,sferik/Nim,singularperturbation/Nim,gokr/Nim,sferik/Nim,zachaysan/Nim,Salafit/Nim,BlaXpirit/nim,Matt14916/Nim,greyanubis/Nim,BlaXpirit/nim,zachaysan/Nim,douglas-larocca/Nim,SSPkrolik/Nim,gokr/Nim,BlaXpirit/nim,xland/Nim,dom96/Nim,greyanubis/Nim,zachaysan/Nim,douglas-larocca/Nim,Dhertz/Nim,Dhertz/Nim,russpowers/Nim,JCavallo/Nim,judofyr/Nim,jfhg/Nim,nanoant/Nim,msmith491/Nim,endragor/Nim,tmm1/Nim,russpowers/Nim,judofyr/Nim,singularperturbation/Nim,fmamud/Nim,MrJohz/Nim,greyanubis/Nim,mbaulch/Nim,fredericksilva/Nim,nafsaka/Nim,gokr/Nim,tulayang/Nim,haiodo/Nim,singularperturbation/Nim,mbaulch/Nim,mbaulch/Nim,fmamud/Nim,bvssvni/Nim,kirbyfan64/Nim,kirbyfan64/Nim,Dhertz/Nim,BlaXpirit/nim,jsanjuas/Nim,jfhg/Nim,sferik/Nim,sferik/Nim,SSPkrolik/Nim,haiodo/Nim,Matt14916/Nim,Salafit/Nim,sferik/Nim,fmamud/Nim,bvssvni/Nim,kirbyfan64/Nim,dom96/Nim,tmm1/Nim,xland/Nim,MrJohz/Nim,nanoant/Nim,xland/Nim,Matt14916/Nim,BlaXpirit/nim,JCavallo/Nim,singularperturbation/Nim,reactormonk/nim,nimLuckyBull/Nim,SSPkrolik/Nim,gokr/Nim,nimLuckyBull/Nim,fmamud/Nim,fredericksilva/Nim,gokr/Nim,nimLuckyBull/Nim,douglas-larocca/Nim,russpowers/Nim,nanoant/Nim,singularperturbation/Nim,kirbyfan64/Nim,mbaulch/Nim,tmm1/Nim,judofyr/Nim,nafsaka/Nim,Salafit/Nim,nanoant/Nim