This replaces the current generic syntax for functions and replaces
it with the concept of inline parameters.
This paves the way for the "all structs anonymous" proposal.
Closes#151.
* Introduce the concept of packages. Closes#3
* Add support for error notes.
* Introduce `@import` and `@c_import` builtin functions and
remove the `import` and `c_import` top level declarations.
* Introduce the `use` top level declaration.
* Add `--check-unused` parameter to perform semantic
analysis and codegen on all top level declarations, not
just exported ones and ones referenced by exported ones.
* Delete the root export node and add `--library` argument.
* Directives can have arbitrary expressions as parameters
* Fix switch statement not generating code sometimes
* Rename "main" fn in bootstrap.zig to "zig_user_main" to
avoid name collisions
* codegen: fix badref when unreachable is last thing in an
expression
* support #condition directive on exported functions
See #88
Also, includes partial implementation of typedef top level declaration.
See #95
Also, fix function types. Previously the way we were deduping function type
pointers was incorrect.
