Introducing Lib Tags for Declaring Direct Function Mapping Compilation

[Alexius-Huang]

What?
Related to #83, introduce several library tags:

• @direct-function-mapping ~ @end is the region to declare direct function mappings
• @maps which maps to the name of the JavaScript method, default is the same name as the original function
• @params which is the parameters of the method, default is no parameters
• @returns is the return type of the method, default returns Void

Why?
Instead of configuring the builtin method inside parser, it is better to decouple these builtin methods and config by importing library files.

How?
Sample Wyrd Code

@direct-function-mapping
  puts @maps("console.log") @params(Str)
  warn @maps("console.warn") @params(Str)
  ...
@end

No Compiled Result, but will be builtin methods.