Remove some indentation from file generation for specific languages,
allow SnippetWriter's io.Writer to be accessed, and add Path to
types.Name for languages where Package and Path can be disjoint.
* Add support for pointers, map keys, more builtins, Alias types
* Support for packages & imports
* Add helper functions to types
* change generation interface
* fix naming/ordering
* SnippetWriter for templates
* Naming systems
* Use the standard packages for import resolution
* Documentation
