Custom language support

[arnav56745]

Hi, its me again.
** 3 Issues in one repo! **
Anyway, I want custom language support for editor
Like

class MyLexer:
      keywords = ["echo", "rmdir", "if"]
e = Editor(root, lexer=MyLexer)
e.pack()

[arnav56745]

@billyeatcookies Anything you want to say

[tomlin7]

@arnav56745 sorry for the delay (uni)

since cupcake uses pygments this will be easy to setup!
https://pygments.org/docs/lexerdevelopment/#regexlexer
https://pygments.org/docs/lexerdevelopment/#using-a-lexer

[tomlin7]

i will implement a cleaner api for this!

[arnav56745]

great! keep it on
i also want an active pr