Revert "smarty: Use a separate processor for angled quotes"
Revert "smarty: Use a separate processor for angled quotes"

That commit caused a regression where `<<` and `>>` inside code
blocks were wrongly replaced with double quotes.

This reverts commit 5029d829c1532f31adc9acbf54d88bb469a69a4f.

joachimneu/Python-Markdown,waylan/Python-Markdown,me-and/Python-Markdown,fernandezcuesta/Python-Markdown,fernandezcuesta/Python-Markdown,cyisfor/Python-Markdown,gogobook/Python-Markdown,joachimneu/Python-Markdown,fernandezcuesta/Python-Markdown,joachimneu/Python-Markdown,waylan/Python-Markdown,evertqin/Python-Markdown,me-and/Python-Markdown,cyisfor/Python-Markdown,gogobook/Python-Markdown,gogobook/Python-Markdown,evertqin/Python-Markdown,evertqin/Python-Markdown,cyisfor/Python-Markdown,me-and/Python-Markdown