April Fool

Back port some of the changes in decompile3 here which mostly helps 3.7 and 3.8 decompilation, although this may also help 3.6ish versions too.

• Handle nested async for in for... and better async comprehension detection via xdis. Still more work is needed.
• include token number in listings when -g and there is a parser error
• remove unneeded Makefiles now that remake 4.3+1.5dbg is a thing that has -c
• Bug in finding annotations in functions with docstrings
• Fix bug found by 2.4 sre_parse.py testing
• Fix transform module's ifelseif bugs
• Fix bug in 3.0 name module detection
• Fix docstring detection