UnicodeEncodeError when piping from `agenda`

[Nitemice]

Similar to #335, but some of the conditions & error are different.

Steps to reproduce:

1. Add an event to a default calendar called Birthday Extravaganza!! 🎈🎈 at 9 p.m.
2. gcalcli --nocolor agenda 12am 11:59pm

   Sun Oct 14 9:00pm Birthday Extravaganza!! 🎈🎈

3. gcalcli agenda 9pm 11pm | findstr Birth*

   Traceback (most recent call last):
   File "C:\Python37\Scripts\gcalcli-script.py", line 11, in <module>
   load_entry_point('gcalcli==4.0.0a5', 'console_scripts', 'gcalcli')()
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\gcalcli.py", line 1614, in main
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\gcalcli.py", line 1170, in AgendaQuery
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\gcalcli.py", line 1154, in _display_queried_events
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\gcalcli.py", line 1036, in _iterate_events
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\gcalcli.py", line 732, in _PrintEvent
   File "C:\Python37\lib\site-packages\gcalcli-4.0.0a5-py3.7.egg\gcalcli\printer.py", line 91, in msg
   File "C:\Python37\lib\encodings\cp1252.py", line 19, in encode
   return codecs.charmap_encode(input,self.errors,encoding_table)[0]
   UnicodeEncodeError: 'charmap' codec can't encode characters in position 35-36: character maps to <undefined>

   gcalcli-4.0.0a5, Python 3.7.0, Microsoft Windows 10 (1803), using cmd, or powershell

The workaround mentioned in #335 (setting PYTHONIOENCODING=utf8) works here too, but I thought it was worth reporting anyway, as I'm running Py3.

[jcrowgey]

I don't know anything about Windows. 'charmap' is not a codec I've ever heard of. I remember cmd from when I was little. I don't know what a powershell is. That said, I don't keep up with the latest minutia of python minor version release changes. I'm slowly migrating to 3.6 from 3.5, maybe this charmap thing is a 3.7 concept that I just haven't encountered yet.

I'm inclined to close this as wontfix unless:

1. someone can repro this on a supported platform
2. someone can show how this isn't window's specific
3. or other maintainers have some interest in supporting Windows.

Anyone interested?

[yulqen]

"charmap" is not a 3.7 thing. charmap_encode() is undocumented but seems to be used for handling encodings such as Windows' cp1252 - see characters it handles at https://github.com/python/cpython/blob/master/Lib/encodings/cp1252.py. 🎈 - (U+1F388) cannot be encoded here hence the need for UTF-8. Don't know enough about Python character encoding to be able elegantly handle pipes/Powershell, etc. Windows!