major release 3.0.0

[cicirello]

Summary

This PR is for the next major release, v3.0.0. It includes the following:

• Increased minimum support level to Java 11.
• Moved the more general randomization and math utilities to a new library, ρμ.
• That new library is now a dependency so users of JPT who are using a dependency manager that handles transitive dependencies, such as maven, gradle, etc will still have access to that functionality. Any users who have been manually downloading JPT's jar will need to be made aware of this new dependency.
• JPT now uses Java modules, specifically providing a module org.cicirello.jpt.
• Restructures directory hierarchy to use Maven's default, rather than the previous custom structure. This is a non-functional change and only affects those developing the library.
• Moved org.cicirello.util package to a new library, which provides that package. New library is org.cicirello.core.
• Additionally generates a jar-with-dependencies (stripped of module-info, as such a fat-jar would not be usable on the module-path).

Closing Issues

Closes #150
Closes #151
Closes #152
Closes #153
Closes #154
Closes #156
Closes #157

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvements to existing code, such as refactoring or optimizations (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.