🎨 new function and simple changes

♻️ code refactoring

Changes 👨‍💻 🥷 👽

Change Log:

- [x] User enumerate
    User enumeration is only available in aggressive enumeration mode.

- [x] Adaptation of EnumerateModel
    Enumeration of users is done using json, so we depend on a struct to do the conversion from json to struct.
    Therefore, I decided to make an adaptation of the EnumerateModel, so there is no need to create another model.

- [x] cli/cmd/root.go
    Better in cli and code.

- [x] internal/banner/helper.go
    Renaming a function from `green` to `format_green`;
    Now the banner has the new project description;
    Some usage instructions removed due to not including these flags in v2.

- [x] internal/printer/printer.go
    Some functions that were not used have been removed.

- [x] tools/enumerate/enumerate.go
    Renaming some variables to better understand their use.

Merge pull request #22 from blackcrw/wprecon-v2

Version 1.* had a lot of bugs, mainly due to the structuring of go packages and codes.

Version 2.* is focused on improving all aspects of wprecon such as appearance, performance, displayed information, multithreading and many other things.

For now the project is still in its alpha/beta version.