rl_codecs.py: add extension codecs support (for extpdfdoc) & make more readable
rl_codecs.py: add extension codecs support (for extpdfdoc) & make more readable

Distrotech/reportlab,Distrotech/reportlab,kanarelo/reportlab,kanarelo/reportlab,Distrotech/reportlab,kanarelo/reportlab,kanarelo/reportlab,kanarelo/reportlab,Distrotech/reportlab,Distrotech/reportlab