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 :warning:
include/mockturtle/algorithms/lut_mapper.hpp	78.78%	14 Missing :warning:
include/mockturtle/networks/block.hpp	91.37%	5 Missing :warning:
include/mockturtle/utils/tech_library.hpp	90.90%	1 Missing :warning:

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ 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 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.