add create_acl_with_sender syntax sugar

[maurerle]

this function can be passed as a dict to the send_message, sparing a second receiver_addr argument

I wonder what you think about this, but it adds a lot of comfort instead of having to write the receiver_addr twice.

This would need more documentation and a test or two though.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.62%. Comparing base (b0c1850) to head (ca0b455).

Files with missing lines	Patch %	Lines
mango/messages/message.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #128      +/-   ##
===============================================
- Coverage        88.65%   88.62%   -0.04%     
===============================================
  Files               22       22              
  Lines             2407     2409       +2     
===============================================
+ Hits              2134     2135       +1     
- Misses             273      274       +1     

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