Manipulate windows with network data types

[lee30sonia]

network_utils:

• clone_subnetwork: Dump a window into an independent network.
• insert_ntk: Insert an (optimized) network cloned from a window back into the original network.

[coveralls]

Pull Request Test Coverage Report for Build 778925684

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 81.293%

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Files with Coverage Reduction	New Missed Lines	%
include/mockturtle/algorithms/dsd_decomposition.hpp	3	87.32%

Totals
Change from base Build 778541321:	-0.02%
Covered Lines:	10873
Relevant Lines:	13375

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💛 - Coveralls

[codecov-commenter]

Codecov Report

Merging #451 (1e76ed0) into master (1ca8964) will increase coverage by 0.00%.
The diff coverage is 77.77%.

@@           Coverage Diff           @@
##           master     #451   +/-   ##
=======================================
  Coverage   80.99%   80.99%           
=======================================
  Files         118      120    +2     
  Lines       12796    12850   +54     
=======================================
+ Hits        10364    10408   +44     
- Misses       2432     2442   +10     

Impacted Files	Coverage Δ
include/mockturtle/utils/network_utils.hpp	73.17% <73.17%> (ø)
include/mockturtle/utils/debugging_utils.hpp	92.30% <92.30%> (ø)
...tle/algorithms/resyn_engines/xag_resyn_engines.hpp	89.78% <0.00%> (+0.42%)	⬆️
include/mockturtle/views/topo_view.hpp	100.00% <0.00%> (+1.78%)	⬆️

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