[kernel] Pass objects not handles to syscall impls

This commit contains a couple large, interdependent changes:

- In preparation for capability checking, the _syscall_verify_*
  functions now load most handles passed in, and verify that they exist
  and are of the correct type. Lists and out-handles are not converted
  to objects.
- Also in preparation for capability checking, the internal
  representation of handles has changed. j6_handle_t is now 32 bits, and
  a new j6_cap_t (also 32 bits) is added. Handles of a process are now a
  util::map<j6_handle_t, handle> where handle is a new struct containing
  the id, capabilities, and object pointer.
- The kernel object definition DSL gained a few changes to support auto
  generating the handle -> object conversion in the _syscall_verify_*
  functions, mostly knowing the object type, and an optional "cname"
  attribute on objects where their names differ from C++ code.
  (Specifically vma/vm_area)
- Kernel object code and other code under kernel/objects is now in a new
  obj:: namespace, because fuck you <cstdlib> for putting "system" in
  the global namespace. Why even have that header then?
- Kernel object types constructed with the construct_handle helper now
  have a creation_caps static member to declare what capabilities a
  newly created object's handle should have.

assets/grammars/definitions.g

@@ -2,7 +2,7 @@ start: import_statement* (object|interface)+
 
 import_statement: "import" PATH
 
-object: description? "object" name options? super? "{" uid method* "}"
+object: description? "object" name options? super? "{" uid cname? method* "}"
 
 interface: description? "interface" name options? "{" uid interface_param* "}"
 
@@ -12,6 +12,8 @@ expose: "expose" type
 
 uid: "uid" UID
 
+cname: "cname" IDENTIFIER
+
 super: ":" name
 
 function: description? "function" name options? ("{" param* "}")?