Updates to mapping

[aletempiac]

This PR contains:

• Removing the RewriteFn template from exact_library
• Adding support minimization when deriving the lut_network in lut_map
• Deactivating buffer/inverter sweeping in lut_map when StoreFunction is true (bug fix)
• Adding substitute node methods in block_network
• Adding xag_balancing

[codecov-commenter]

Codecov Report

Attention: 46 lines in your changes are missing coverage. Please review.

Comparison is base (d0fddde) 83.67% compared to head (789491e) 83.69%.

Files	Patch %	Lines
include/mockturtle/algorithms/xag_balancing.hpp	89.12%	26 Missing ⚠️
include/mockturtle/algorithms/lut_mapper.hpp	78.78%	14 Missing ⚠️
include/mockturtle/networks/block.hpp	91.37%	5 Missing ⚠️
include/mockturtle/utils/tech_library.hpp	90.90%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #627      +/-   ##
==========================================
+ Coverage   83.67%   83.69%   +0.02%     
==========================================
  Files         185      186       +1     
  Lines       28840    29213     +373     
==========================================
+ Hits        24132    24451     +319     
- Misses       4708     4762      +54     

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