Revert "use renderer for task lists. see #107 #111."

This reverts commit a5e39a6a59a91a7c8fa88e9113ba4dde7264e33b.
Revert "rough implementation of task lists. see #107 #111."

This reverts commit 26cef98d7261cb8330c07eceff250254124f20d8.
comment.
v0.3.2. closes #356.