Highlight schema syntax templates in the reference

[johansolbakken]

Highlights the syntax templates in the schema reference and the .model file reference, such as

field [name] type [type-name] {
    [body]
}

• A new Rouge extension, _plugins/rouge_schema_placeholders.rb, colors a bracketed placeholder in schema code as one emphasized token, like the XML placeholders in _plugins/rouge_xml_placeholders.rb. Without it, words in a placeholder are colored as schema, e.g. type in [type-name] as a keyword. A placeholder starts with a letter and does not follow a name, a closing bracket or ):, so tensor dimensions (x[384]) and tensor values (tensor(x[3]):[1, 2, 3]) are not affected. None of the schema blocks already highlighted on the site changes.
• Tags 67 templates in schemas.html and model-files.html as schema, and the inputs and constants examples in schemas.html. Links in the templates are kept.
• Fixes tensor(key{}]) to tensor(key{}) in the constants example.

The overview of schema elements at the top of schemas.html and the query syntax [field-name].[component-name]:term stay plain.

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