Add B4X

[DecimalTurn]

Description

Closes #6944

Notes on the regex used:
(?:.*(?:\r?\n|\r)){0,9} is used to limit our search to the first 10 lines.
\A\W{0,3} is there in case the file has the UTF-8 BOM which is represented by 3 non-alphanumeric characters. (More than 70% of B4X files have the BOM)

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?q=path%3A*.bas+%2F%5CA%28%3F%3A.*%28%3F%3A%5Cr%3F%5Cn%7C%5Cr%29%29%7B0%2C9%7D%5E%5CW%7B0%2C3%7DB4%28%3F%3AJ%7CA%7CR%7Ci%29%3Dtrue%2F+NOT+user%3AAnywhereSoftware+NOT+is%3Afork&type=code

  • I have included a real-world usage sample for all extensions added in this PR:

    • Sample source(s):
      • https://github.com/AnywhereSoftware/B4X-Pleroma/blob/master/OAuth.bas
      • https://github.com/AnywhereSoftware/B4X-Pleroma/blob/master/RequestsManager.bas
      • https://raw.githubusercontent.com/AnywhereSoftware/X2/2244d0f5fa9db0dd107cacd7bb4ff6466ba98312/Tetris/B4XMainPage.bas
    • Sample license(s):
      • Apache-2.0 license
      • Apache-2.0 license
      • Apache-2.0 license

  • [ ] I have included a syntax highlighting grammar: [URL to grammar repo] Using existing VBA grammar

  • I have added a color

    • Hex value: #00e4ff
    • Rationale: Main color of the logo for B4X/AnywhereSoftware

  • I have updated the heuristics to distinguish my language from others using the same extension.

[lildude]

LGTM. Thanks.

Note: this PR will not be merged until close to when the next release is made. See here for more details.

[DecimalTurn]

Sorry for the many edits post-review, I'm done now. I just wanted to make the regex simpler, but then realized that there might be a problem with the fact that Linguist is matching with a ASCII_8BIT encoded string, but some other ports of Linguist might be matching in UTF-8 mode. Hence, it's safer to express the BOM as \W{0,3} since it needs to be able to match 3 characters in ASCII_8BIT for Ruby, but also a single character in UTF-8 mode for various ports.

Related:

• tokenizer: capture non-ASCII identifiers #3748
• fix errors on non-UTF-8 encodings #4730