OneMore Markdown fenced code block syntax highlight

专用于支持 Markdown fenced code block 语法高亮。如果哪天官方支持了，就干掉这个库。

in vec4 position;
uniform mat4 matrix;
void main() {
  gl_Position = matrix * position;
}

half3 ColorGrading(half3 color) 
{
    color *= _PostExposure;
    float3 colorLutSpace = saturate(LUT_SPACE_ENCODE(color.rgb));
    color = ApplyLut2D(TEXTURE2D_PARAM(_Lut2D, sampler_Lut2D), colorLutSpace, _Lut2D_Params);
    return color;
}

// glsl 的代码，先顶着
in vec4 position;
uniform mat4 matrix;
void main() {
  gl_Position = matrix * position;
}

Shader "Demo" {
    Properties{
        _MainTex("Base (RGB)", 2D) = "white" {}
    }
    HLSLINCLUDE
    TEXTURE2D_SAMPLER2D(_MainTex, sampler_MainTex);
    half4 _MainTex_TexelSize;
    ENDHLSL
}

VSCode Markdown Fenced Code Block Grammar Injection Example

Demonstrates how an extension can inject support for a new grammar in VSCode's builtin markdown grammar for fenced code blocks. This extension injects an alias for JavaScript called superjs so support editor highlighting of blocks that look like:

```superjs
someJsCode
```

Structure

• package.json - VS Code extension manifest file. The contributes.grammars section registers the injected grammar.
• syntaxes/codeblock.json - The injected grammar itself

How to modify this repo to support a new language in fenced code blocks

1. In syntaxes/codeblock.json, change the begin rule from superjs to the identifier of your target language. This identifier is what people will write in markdown.
2. In syntaxes/codeblock.json, change the inner include rule from "source.js" to the scope of your target language. This scope can be found by looking at the target language's grammar.
3. In syntaxes/codeblock.json, change the contentName from using superjs to using a identifier for your language. This identifier may only contain letters but does not have to match the identifier from step 1.
4. In syntaxes/codeblock.json, change the scopeName from using superjs to using a identifier for your language. This identifier may only contain letters but does not have to match the identifier from step 1.
5. In package.json, change the scopeName to match the scopeName from step 4.
6. In package.json, change embeddedLanguages to map between the contentName from step 3 and the VS Code identifier for your language.
7. In package.json, change the id from using superjs-injection to using an identifier for your grammar injection. This identifier does not have to match the identifier from step 1.
8. In package.json, change the language from using superjs-injection to using an identifier for your grammar injection. This identifier has to match the identifier from step 7.