HTML-to-markup conversion for status output to console/clipboard

This introduces a dependency on html2text. The library works
well for our limited use cases, but has not been updated since
2020.

toot/output.py

@@ -277,6 +277,7 @@ def print_status(status, width):
     h2t.wrap_links = True
     h2t.wrap_list_items = True
     h2t.wrap_tables = True
+    h2t.unicode_snob = True
     h2t.ul_item_mark = "\N{bullet}"
 
     text_status = h2t.handle(content).strip()

toot/tui/app.py

@@ -624,6 +624,7 @@ class TUI(urwid.Frame):
         h2t.body_width = 0  # nowrap
         h2t.single_line_break = True
         h2t.ignore_links = True
+        h2t.unicode_snob = True
         h2t.ul_item_mark = "\N{bullet}"
 
         time = parse_datetime(status.original.data['created_at'])