Llnl-shroud

Added
- Support class static methods.
- Add enum as a declaration.

- decl: enum color { RED, GREEN, BLUE }

- Add typedef as a declaration.

- decl: typedef int TYP

Changed
- base name 'wrapped' changed to 'shadow'. This may appear in YAML file.
- Change generated code to prefix symbols with the namespace, `outer::function()`,
instead of adding namespace statements, `namespace outer { }`.
Types also require namespaces in `cxx_type` and `c_to_cxx` entries.
The wrappers use the namespace but do not add to it.
- Change format of YAML file to generalize declarations and provide
access to namespaces.

Old
functions:
- decl: void foo()
New
declarations:
- decl: void foo()

Old
namespace: tutorial
functions:
- decl: void bar()
New
declarations:
- decl: namespace tutorial
declarations:
- decl: void bar()

Old
types:
CustomType:
typedef: int
New
declarations:
- typedef: CustomType
fields:
typedef: int

Added
- Support for function pointer arguments.
- Improve support for Python wrappers, including NumPy support.
Use constructor and destructor with extension types.
- Added implied attribute used to compute value of an argument which
is in the C++ API but does not need to be explicit in the Fortran API.
- Added allocatable attribute used to allocate arrays with intent(out).
Use the mold attribute to define shape of allocated array.

Fixed
- Add continuations to long lines.
This helps Fortran which has a line length limit.
- Write generic interface for overloaded constructors.

Changed
- Attributes for a function now go at the end.
void Foo+len=30 () => void Foo() +len(30)
Fixes an ambiguity in attributes without values: Foo +attr(int i)
- Change prefix of local variables to SHC_ or SHCXX_ to indicate their usage.
- Added more local variables to convert between languages instead of doing
conversion in-line (in the call or return statements)

Added
- cpp_if will add an if directive around a class or function.
- Allow 'functions' to be used in YAML in place of 'methods'.
'methods' still works but only one should be provided.
- Allow format fields to be set by directly in YAML.

Fixed
- Allow `std:string *` arguments and results.

Changed
- All cpp_ prefixes for options and fmt have changed to cxx_.
- Moved many options and fields into format. This eliminates
copying options and fields into format and makes it clearer
where to set formats.

Fixed
- Respect wrap_* options for classes.

Changed
- Improved API for creating LibraryNode instances by using keyword arguments.
- Factored out routine create_library_from_dictionary for dealing with YAML
generated dictionary.
- Moved code into generate.py which generates additional routines to wrap.

Added
- File shroud/ast.py with LibraryNode, ClassNode, and FunctionNode.

Added
- Recursive Descent Parser to replace Parsley.
- Parse `long long`.
- Parse constructors and destructors using C++ syntax.
`Class * new() +constructor` changed to `Class() +name(new)`
- Ability to wrap pure C library.
`language: c` at the top level of YAML file.

Removed
- Parsley dependency.