Big structure changes (check commit description)

- Moved most of the parser functions/files to the core package.
- Converted tools file to a package and made separate files for similar functions.
- Now all fetcher engines return a Response object
- Instead of selecting an engine to use and passing config to it, we have separate fetcher classes so the user can choose what to use while importing.
- I added a new custom fetcher so the user can create and use an engine.
- More...

README.md

@@ -477,6 +477,8 @@ This project includes code adapted from:
 - [brotector](https://github.com/kaliiiiiiiiii/brotector)
 - [fakebrowser](https://github.com/kkoooqq/fakebrowser)
 - [rebrowser-patches](https://github.com/rebrowser/rebrowser-patches)
+- [Vinyzu](https://github.com/Vinyzu)'s work on Playwright's mock on [Botright](https://github.com/Vinyzu/Botright)
+- [Daijro](https://github.com/daijro)'s brilliant work on both [BrowserForge](https://github.com/daijro/browserforge) and [Camoufox](https://github.com/daijro/camoufox)
 
 ## Known Issues
 - In the auto-matching save process, the unique properties of the first element from the selection results are the only ones that get saved. So if the selector you are using selects different elements on the page that are in different locations, auto-matching will probably return to you the first element only when you relocate it later. This doesn't include combined CSS selectors (Using commas to combine more than one selector for example) as these selectors get separated and each selector gets executed alone.