* Add solution generator and evaluator for SA (#67)

* Add warm startup for SA using population_generator.

* Revert evaluator parametrization in SA.

* Working on implementing a IntegerFloatSolution class

* Update nsgaiii.py (#70)

removed obsolete import

* Fix conflict in file smpsorp_zdt4.py

* Add new implementation of quality indicators. All of them receive a numpy array as a parameter instead of a list of solutions.

* Refactor quality indicators. All of them receive as a parameter a numpy array instead of a list of solutions

* Add file ZDT1.pf in the test folder (to be use to test quality indicators)

* Feature/mixed solution (#73)

* Working on implementing a IntegerFloatSolution class

* Add unit test cases for class IntegerFloatProblem

* Add class NMMin

* Add class IntegerFloatSBXCrossover

* Add test cases for SBXCrossover

* Still working on implementing an approach for the IntegerFloatSolution class

* Add user defined exceptiones in file checking.py

* Working on the implementation of class CompositeSolution

* Workon on class CompositeSolution

* Class CompositeMutation implemented and tested

* Fix a bug in class Neighborhood

* Class CompositeCrossover implemented and tested

* Add class

* Add class

* Rename file

* Add problem ZDT1Modified

* Add examples with NSGA-II

* Add NSGA-II examples

* Optimize imports

* Minor changes

* Changes on attribute name

Co-authored-by: Yebisu <ajnebro@outlook.com>

* Minor changes

* Release v1.5.4

* Updating the MOEAD and variants examples

* Minor changes

* Add problem UF1

* Fix bug in ibea.

* Refactor crossover and mutation operators

* Refactor crossover and mutation operators

* New minor version 1.5.5

Co-authored-by: Yevhenii Semendiak <32543098+YevheniiSemendiak@users.noreply.github.com>
Co-authored-by: ajnebro <ajnebro@outlook.com>
Co-authored-by: Marvin Steijaert <msteijaert@gmail.com>
Co-authored-by: benhid <atbnhd@gmail.com>
Co-authored-by: Sizhe Yuen <sizhe1007@gmail.com>
Co-authored-by: Antonio J. Nebro <ajnebro@users.noreply.github.com>