Add B programming language

[aceinetx]

Added the B programming language (C predecessor)

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.b+%2F%28%3F%3Aextrn%7Cauto%7Cgoto%29%2F
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • https://github.com/bext-lang/b/blob/main/examples/duffs_device.b
      • https://github.com/aceinetx/blang/blob/master/examples/curses.b
      • https://github.com/aceinetx/blang/blob/master/examples/carrying_statement.b
      • https://github.com/aceinetx/blang/blob/master/examples/curses.b
      • https://www.nokia.com/bell-labs/about/dennis-m-ritchie/kbman.html
      • https://www.nokia.com/bell-labs/about/dennis-m-ritchie/bref.html
    • Sample license(s):
      • MIT
      • AGPL-3.0
  • I have included a syntax highlighting grammar
  • I have added a color
    • Hex value: #da7666
    • Rationale: The color is influenced by an unofficial logo in https://github.com/bext-lang/b (B doesn't have an official logo)
  • I have updated the heuristics to distinguish my language from others using the same extension.

[DecimalTurn]

Related issue: #6717

[DecimalTurn]

For the search results, it might be better to use the same regex as used in the heuristic to illustrate that we have reached the 2k file threshold. Eg.: https://github.com/search?type=code&q=NOT+is%3Afork+path%3A*.b+%2F%28%3F%3Aextrn%7Cauto%7Cgoto%29%2F (7.2k files)

[DecimalTurn]

Ideally, we'd also include a rule for Limbo and Brainfuck (Bf).

There's already rules inside the heuristics.yml file that we can re-use:

  - language: Brainfuck
    pattern: '(>\+>|>\+<)'

and

  - language: Limbo
    pattern: '^\w+\s*:\s*module\s*\{'

[DecimalTurn]

B doesn't have an official logo

What about this one?

From here: https://github.com/bext-lang/b

The color of the logo is already close enough with what is suggested here (#da7666), so I'm not saying it has to be changed, but at least this logo could be used as a rationale for the color.

[DecimalTurn]

For some of these fields, like for tm_scope, it's worth considering if using the same values as the C programming language would be beneficial. You can check how the C syntax highlighing of a B file would look like using https://novalightshow.netlify.app/

[aceinetx]

Apart from the extrn keyword it looks pretty much the same as C

[lildude]

The samples added do not match the list in the template. They are also mostly illustrations of using the language rather than real world examples of usage of the language. Please correct this.