Changes to send_mail function

[rohangirishrao]

Made the function more generalised and added accurate notes as to usage of the method.

[codecov]

Codecov Report

Attention: Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 24.98%. Comparing base (8cef7bf) to head (2027558).
Report is 12 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/imcflibs/imagej/misc.py	8.33%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #52      +/-   ##
==========================================
- Coverage   25.06%   24.98%   -0.08%     
==========================================
  Files          25       25              
  Lines        1656     1661       +5     
==========================================
  Hits          415      415              
- Misses       1241     1246       +5     

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