Merge branch 'hotfix-0.3.1'
Merge branch 'release-0.4.0'
Merge branch 'release-0.4.1'
Merge branch 'release-0.4.1'
add an overload of registerHandler
add an entry to the ChangeLog for the overload of registerHandler
Merge branch 'feature-easy-register' into develop
replace constexpr by inline for Hash with std::string
move updateEntity in child classes
add SingleSystem and CustomSystem
update ChangeLog for the systems changes
Merge branch 'feature-systems' into develop
bump version to 0.5.0
add the date for version 0.5.0 in the ChangeLog
Merge branch 'release-0.5.0'
Merge branch 'release-0.5.0' into develop
initialize properly m_entity in SingleSystem
Merge branch 'hotfix-singlesystem-init' into develop