Replacing typish with runtype

[jmwright]

@adam-urbanczyk As discussed in #1966 this PR attempts to replace typish with runtype. Let me know if you think there is a better replacement for get_type than get_origin.

[adam-urbanczyk]

I think some massaging will be needed. I propose to add a simple instance_of wrapper in utils and use some casts in the body.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.86%. Comparing base (372ae55) to head (0e71451).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1967      +/-   ##
==========================================
+ Coverage   95.84%   95.86%   +0.01%     
==========================================
  Files          29       29              
  Lines        7951     7949       -2     
  Branches     1194     1194              
==========================================
- Hits         7621     7620       -1     
+ Misses        192      191       -1     
  Partials      138      138              

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[jmwright]

@adam-urbanczyk Better?

[jmwright]

Closes #1966

[adam-urbanczyk]

Thanks!

[adam-urbanczyk]

Thanks @jmwright , shall we merge?

[jmwright]

Sure, I'll do that now.