Use django-autocomplete-light and change chosen for select2 to allow performance optimizations

[submarcos]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.88%. Comparing base (7b540f0) to head (e96a51a).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
mapentity/forms.py	80.95%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
- Coverage   91.97%   91.88%   -0.09%     
==========================================
  Files          33       33              
  Lines        2479     2501      +22     
==========================================
+ Hits         2280     2298      +18     
- Misses        199      203       +4     

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