LICENSE file generation during project generation with License meta-variables

[hrszpuk]

Description

This pull request adds LICENSE file generation along with a series of bug fixes to the related systems. LICENSE file generation was planned feature of ReCTx originating from the old Rust-based codebase.

This feature generates a LICENSE file chosen by the user. There are multiple options (including "None"). A file containing license information will be generated along with the other project files.

Problems solved

• Added LICENSE file generation)
• Fixed infinite prompt bug
• Fixed "None" License bug
• Fixed LICENSE file generation bug
• Fixed meta variable replacement bugs
• Fixed year/day go rune bug

Related Issues/PR

• Close #56

[hrszpuk]

I'm more open to moving a lot of the licenses/ management from config to the license package, same with templates/ management and the template package.