Finish up parser and assembler with more-or-less complete syntax

Major changes inlude:

* Bit the bullet and now instructions have their length hard-coded
* Move from_utf8 object parsing to be done by their objects (instead of
  a Parser god object)
* A list of AST sections are assembled into an Object using the new
  vm::obj::assemble module.
* Changed the object layout some in the spec, and adjusted code to match
  this.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/vm/obj/syn/convert.rs

@@ -0,0 +1,2 @@
+struct GetLayout {
+}