py/repl: Don't look inside strings for unmatched brackets/quotes.
py/repl: Don't look inside strings for unmatched brackets/quotes.

When looking to see if the REPL input needs to be continued on the next
line, don't look inside strings for unmatched ()[]{} ''' or """.

Addresses issue #1387.

PappaPeppar/micropython,alex-robbins/micropython,matthewelse/micropython,ruffy91/micropython,mgyenik/micropython,noahwilliamsson/micropython,lowRISC/micropython,AriZuu/micropython,pfalcon/micropython,stonegithubs/micropython,noahchense/micropython,lbattraw/micropython,ernesto-g/micropython,ernesto-g/micropython,swegener/micropython,kerneltask/micropython,stonegithubs/micropython,ericsnowcurrently/micropython,infinnovation/micropython,cloudformdesign/micropython,kerneltask/micropython,adamkh/micropython,turbinenreiter/micropython,pfalcon/micropython,martinribelotta/micropython,MrSurly/micropython,ryannathans/micropython,ahotam/micropython,ernesto-g/micropython,henriknelson/micropython,ceramos/micropython,xuxiaoxin/micropython,mhoffma/micropython,xhat/micropython,tralamazza/micropython,adamkh/micropython,dxxb/micropython,trezor/micropython,lbattraw/micropython,turbinenreiter/micropython,xyb/micropython,mpalomer/micropython,xuxiaoxin/micropython,dhylands/micropython,adafruit/circuitpython,infinnovation/micropython,oopy/micropython,ernesto-g/micropython,HenrikSolver/micropython,pramasoul/micropython,dxxb/micropython,ahotam/micropython,tobbad/micropython,feilongfl/micropython,alex-march/micropython,chrisdearman/micropython,redbear/micropython,MrSurly/micropython,hiway/micropython,cwyark/micropython,jmarcelino/pycom-micropython,turbinenreiter/micropython,alex-march/micropython,danicampora/micropython,dxxb/micropython,galenhz/micropython,pozetroninc/micropython,mhoffma/micropython,ganshun666/micropython,MrSurly/micropython-esp32,tralamazza/micropython,torwag/micropython,adamkh/micropython,torwag/micropython,Timmenem/micropython,AriZuu/micropython,omtinez/micropython,xyb/micropython,supergis/micropython,blazewicz/micropython,lowRISC/micropython,pozetroninc/micropython,ceramos/micropython,alex-march/micropython,kerneltask/micropython,hosaka/micropython,firstval/micropython,jmarcelino/pycom-micropython,supergis/micropython,trezor/micropython,PappaPeppar/micropython,noahwilliamsson/micropython,MrSurly/micropython,blazewicz/micropython,henriknelson/micropython,jlillest/micropython,toolmacher/micropython,HenrikSolver/micropython,tralamazza/micropython,pfalcon/micropython,drrk/micropython,danicampora/micropython,xhat/micropython,AriZuu/micropython,utopiaprince/micropython,pramasoul/micropython,feilongfl/micropython,emfcamp/micropython,martinribelotta/micropython,swegener/micropython,lowRISC/micropython,trezor/micropython,omtinez/micropython,MrSurly/micropython,tdautc19841202/micropython,praemdonck/micropython,Timmenem/micropython,misterdanb/micropython,bvernoux/micropython,emfcamp/micropython,cwyark/micropython,drrk/micropython,omtinez/micropython,oopy/micropython,xhat/micropython,danicampora/micropython,xyb/micropython,TDAbboud/micropython,torwag/micropython,rubencabrera/micropython,mianos/micropython,omtinez/micropython,xuxiaoxin/micropython,vriera/micropython,rubencabrera/micropython,swegener/micropython,neilh10/micropython,heisewangluo/micropython,EcmaXp/micropython,cloudformdesign/micropython,Peetz0r/micropython-esp32,blmorris/micropython,adamkh/micropython,tobbad/micropython,ganshun666/micropython,Peetz0r/micropython-esp32,micropython/micropython-esp32,ChuckM/micropython,SHA2017-badge/micropython-esp32,redbear/micropython,pozetroninc/micropython,noahwilliamsson/micropython,kostyll/micropython,Peetz0r/micropython-esp32,SHA2017-badge/micropython-esp32,kostyll/micropython,dmazzella/micropython,cloudformdesign/micropython,tobbad/micropython,tobbad/micropython,selste/micropython,noahwilliamsson/micropython,oopy/micropython,cwyark/micropython,cloudformdesign/micropython,ahotam/micropython,blmorris/micropython,skybird6672/micropython,hosaka/micropython,mgyenik/micropython,dmazzella/micropython,utopiaprince/micropython,adafruit/circuitpython,heisewangluo/micropython,alex-march/micropython,ChuckM/micropython,ganshun666/micropython,pozetroninc/micropython,vitiral/micropython,kerneltask/micropython,adafruit/micropython,deshipu/micropython,mgyenik/micropython,Peetz0r/micropython-esp32,pozetroninc/micropython,dhylands/micropython,noahchense/micropython,henriknelson/micropython,skybird6672/micropython,utopiaprince/micropython,tuc-osg/micropython,xuxiaoxin/micropython,Peetz0r/micropython-esp32,ChuckM/micropython,ChuckM/micropython,emfcamp/micropython,bvernoux/micropython,vitiral/micropython,mianos/micropython,MrSurly/micropython-esp32,lowRISC/micropython,mianos/micropython,kostyll/micropython,EcmaXp/micropython,tdautc19841202/micropython,MrSurly/micropython,hiway/micropython,ryannathans/micropython,selste/micropython,redbear/micropython,ryannathans/micropython,deshipu/micropython,ahotam/micropython,EcmaXp/micropython,drrk/micropython,blazewicz/micropython,ruffy91/micropython,toolmacher/micropython,dhylands/micropython,dhylands/micropython,cnoviello/micropython,puuu/micropython,redbear/micropython,matthewelse/micropython,turbinenreiter/micropython,HenrikSolver/micropython,henriknelson/micropython,mpalomer/micropython,martinribelot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python,TDAbboud/micropython,mhoffma/micropython,praemdonck/micropython,blazewicz/micropython,mianos/micropython