Proposed changes to config dialog

[bynect]

Hello, I was experimenting a little bit with config dialogs and I made the following major changes:

• Split into substrings the command and pass them as argument of the respective function. (This eliminates the need for multiple call to prompt)
• Add hints when writing commands in config dialogs (still at an early stage, but functioning). (This was made as a substitution for prompts custom messages)
• Return a bool from detect_extension which indicates if a syntax was found or not

You can see all the changes in this branch: https://github.com/bynect/Teditor/tree/major. Since this are somewhat bigger changes than the others, I was hoping to hear your opinions before creating a pr.

[arthurbacci]

Looks good, I will test it.

[arthurbacci]

PR :?