XypicDiagramDrawer.draw: Split up the method.
XypicDiagramDrawer.draw: Split up the method.

This commit is another one in the series of commits which split up
longish methods in XypicDiagramDrawer by factoring out independent
functionality in separate methods.  This commit is particularly
concerned with the method ``draw``, which now looks much tidier.

skidzo/sympy,kaushik94/sympy,beni55/sympy,diofant/diofant,AunShiLord/sympy,lindsayad/sympy,kumarkrishna/sympy,shikil/sympy,pandeyadarsh/sympy,wyom/sympy,kaichogami/sympy,lindsayad/sympy,iamutkarshtiwari/sympy,sahilshekhawat/sympy,atreyv/sympy,oliverlee/sympy,mcdaniel67/sympy,grevutiu-gabriel/sympy,shipci/sympy,postvakje/sympy,atsao72/sympy,grevutiu-gabriel/sympy,jerli/sympy,Gadal/sympy,kmacinnis/sympy,VaibhavAgarwalVA/sympy,saurabhjn76/sympy,MechCoder/sympy,yashsharan/sympy,shipci/sympy,maniteja123/sympy,garvitr/sympy,postvakje/sympy,dqnykamp/sympy,wyom/sympy,hrashk/sympy,skidzo/sympy,madan96/sympy,jbbskinny/sympy,hargup/sympy,aktech/sympy,saurabhjn76/sympy,Vishluck/sympy,Titan-C/sympy,amitjamadagni/sympy,kmacinnis/sympy,MridulS/sympy,cccfran/sympy,Arafatk/sympy,Mitchkoens/sympy,madan96/sympy,Mitchkoens/sympy,toolforger/sympy,Designist/sympy,MechCoder/sympy,Shaswat27/sympy,AkademieOlympia/sympy,kevalds51/sympy,kevalds51/sympy,kaichogami/sympy,Titan-C/sympy,Curious72/sympy,debugger22/sympy,Titan-C/sympy,vipulroxx/sympy,abloomston/sympy,hargup/sympy,lindsayad/sympy,jerli/sympy,pandeyadarsh/sympy,chaffra/sympy,amitjamadagni/sympy,maniteja123/sympy,MridulS/sympy,wanglongqi/sympy,mafiya69/sympy,abhiii5459/sympy,rahuldan/sympy,Mitchkoens/sympy,postvakje/sympy,shipci/sympy,skidzo/sympy,wanglongqi/sympy,sunny94/temp,asm666/sympy,AkademieOlympia/sympy,sunny94/temp,kumarkrishna/sympy,MechCoder/sympy,sahmed95/sympy,jaimahajan1997/sympy,sahilshekhawat/sympy,hargup/sympy,souravsingh/sympy,atreyv/sympy,rahuldan/sympy,mcdaniel67/sympy,sampadsaha5/sympy,Davidjohnwilson/sympy,toolforger/sympy,grevutiu-gabriel/sympy,Sumith1896/sympy,madan96/sympy,AkademieOlympia/sympy,cccfran/sympy,farhaanbukhsh/sympy,beni55/sympy,Davidjohnwilson/sympy,mcdaniel67/sympy,AunShiLord/sympy,dqnykamp/sympy,emon10005/sympy,cswiercz/sympy,pandeyadarsh/sympy,vipulroxx/sympy,kmacinnis/sympy,drufat/sympy,moble/sympy,souravsingh/sympy,Arafatk/sympy,Vishluck/sympy,Vishluck/sympy,ahhda/sympy,bukzor/sympy,garvitr/sympy,kevalds51/sympy,hrashk/sympy,ahhda/sympy,ga7g08/sympy,cccfran/sympy,moble/sympy,abhiii5459/sympy,jerli/sympy,bukzor/sympy,abloomston/sympy,ga7g08/sympy,atsao72/sympy,srjoglekar246/sympy,liangjiaxing/sympy,saurabhjn76/sympy,Designist/sympy,asm666/sympy,mafiya69/sympy,jaimahajan1997/sympy,vipulroxx/sympy,iamutkarshtiwari/sympy,sampadsaha5/sympy,ahhda/sympy,ga7g08/sympy,jamesblunt/sympy,abhiii5459/sympy,chaffra/sympy,moble/sympy,skirpichev/omg,souravsingh/sympy,flacjacket/sympy,cswiercz/sympy,jamesblunt/sympy,Davidjohnwilson/sympy,drufat/sympy,yashsharan/sympy,kaushik94/sympy,farhaanbukhsh/sympy,oliverlee/sympy,garvitr/sympy,wyom/sympy,emon10005/sympy,ChristinaZografou/sympy,toolforger/sympy,pbrady/sympy,abloomston/sympy,wanglongqi/sympy,Sumith1896/sympy,sunny94/temp,oliverlee/sympy,jaimahajan1997/sympy,beni55/sympy,jbbskinny/sympy,yukoba/sympy,hrashk/sympy,kaushik94/sympy,aktech/sympy,lidavidm/sympy,yukoba/sympy,iamutkarshtiwari/sympy,yashsharan/sympy,MridulS/sympy,Designist/sympy,kaichogami/sympy,sahmed95/sympy,maniteja123/sympy,chaffra/sympy,pbrady/sympy,liangjiaxing/sympy,bukzor/sympy,Shaswat27/sympy,atsao72/sympy,jamesblunt/sympy,sahilshekhawat/sympy,meghana1995/sympy,Gadal/sympy,Arafatk/sympy,dqnykamp/sympy,Curious72/sympy,Shaswat27/sympy,mafiya69/sympy,jbbskinny/sympy,rahuldan/sympy,drufat/sympy,emon10005/sympy,ChristinaZografou/sympy,ChristinaZografou/sympy,yukoba/sympy,shikil/sympy,aktech/sympy,VaibhavAgarwalVA/sympy,lidavidm/sympy,farhaanbukhsh/sympy,debugger22/sympy,liangjiaxing/sympy,cswiercz/sympy,shikil/sympy,AunShiLord/sympy,atreyv/sympy,meghana1995/sympy,Curious72/sympy,Sumith1896/sympy,sampadsaha5/sympy,debugger22/sympy,meghana1995/sympy,sahmed95/sympy,lidavidm/sympy,pbrady/sympy,VaibhavAgarwalVA/sympy,asm666/sympy,Gadal/sympy,kumarkrishna/sympy