Add more meta scopes

[winstliu]

This issue is a follow-up to a discussion in #206, and as such the prerequisites do not apply.

We've decided that it would be beneficial to add more verbose meta scopes, for example meta.function.c and meta.function.body.c, similar to what language-java does.

public class Example                     // meta.class.java
{                                        // meta.class.java meta.class.body.java
  public static void main(String[] args) // meta.class.java meta.class.body.java meta.method.java
  {                                      // meta.class.java meta.class.body.java meta.method.java meta.method.body.java
                                         // meta.class.java meta.class.body.java meta.method.java meta.method.body.java
  }                                      // meta.class.java meta.class.body.java
}                                        // none

/cc @alpyre