Replace getDefaultCharacterWidth with getBaseCharacterWidth
Replace getDefaultCharacterWidth with getBaseCharacterWidth

That's the language we use throughout the implementation now and a more
accurate name for the concept.

Arcanemagus/atom,liuderchi/atom,atom/atom,andrewleverette/atom,CraZySacX/atom,liuderchi/atom,kevinrenaers/atom,kevinrenaers/atom,PKRoma/atom,brettle/atom,sotayamashita/atom,stinsonga/atom,brettle/atom,stinsonga/atom,Arcanemagus/atom,sotayamashita/atom,PKRoma/atom,brettle/atom,AlexxNica/atom,stinsonga/atom,andrewleverette/atom,t9md/atom,Mokolea/atom,liuderchi/atom,stinsonga/atom,CraZySacX/atom,FIT-CSE2410-A-Bombs/atom,FIT-CSE2410-A-Bombs/atom,Mokolea/atom,Mokolea/atom,decaffeinate-examples/atom,sotayamashita/atom,ardeshirj/atom,atom/atom,Arcanemagus/atom,kevinrenaers/atom,atom/atom,t9md/atom,t9md/atom,decaffeinate-examples/atom,FIT-CSE2410-A-Bombs/atom,andrewleverette/atom,AlexxNica/atom,AlexxNica/atom,decaffeinate-examples/atom,CraZySacX/atom,liuderchi/atom,PKRoma/atom,ardeshirj/atom,decaffeinate-examples/atom,ardeshirj/atom