Optimized remove*() make:entity methods + many nice bug fixes

Hi Makers!

This is release mostly contains numerous minor bug fixes, but also 2 nice features:

• [make:entity] Optimized how the removeXXXX() methods are generated
  for relationships - #675 thanks to @mhabibi!

• [make:serializer:normalizer] Generated a better template, trying to
  guess the class you might be normalizing - #672 thanks to @BatsaxIV

See v1.21.1...v1.22.0 for changes

Happy making!