If FORCE_COLOR is set, tell rich to force_terminal

[AndydeCleyre]

Another try for the case of #243, as an alternative to #345.

This uses rich's force_terminal option whenever FORCE_COLOR is set in the environment, and so applies to any CI system equally. The user is however required to go ahead and set FORCE_COLOR when they want it.

[codecov]

Codecov Report

Base: 84.92% // Head: 84.92% // No change to project coverage 👍

Coverage data is based on head (88d09ed) compared to base (ce9464d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #347   +/-   ##
=======================================
  Coverage   84.92%   84.92%           
=======================================
  Files          21       21           
  Lines        1844     1844           
  Branches      283      283           
=======================================
  Hits         1566     1566           
  Misses        236      236           
  Partials       42       42           

Impacted Files	Coverage Δ
ward/_terminal.py	62.95% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[darrenburns]

Rich itself will check for FORCE_COLOR, and if it's set, it'll set force_terminal=True inside the Console constructor. Funnily enough, it was me that implemented this inside Rich 😄

Not 100% certain the best approach to take here though. I'd like Ward to "just work" without users having to know about this env var.

[AndydeCleyre]

Oh!

Well I'll withdraw this PR for a start.