Implement a Pseudo Objective-C language representation

This is implemented in the Pseudo C plug-in as it shares 99% of the
logic. The Objective-C support is implemented in a subclass of
`PseudoCFunction`. The handling of instruction types that the
Objective-C representation needs to customize is extracted into virtual
functions that the Objective-C subclass overrides.

This currently supports:
 * Rewriting `objc_msgSend` / `objc_msgSendSuper2` with constant
   selectors to `[receiver message]` notation.
 * Rewriting calls to `objc_alloc` / `objc_alloc_init` / `objc_new` to
   the equivalent message send notation.
 * Rewriting `objc_retain` / `objc_release` and friends to the
   equivalent message send notation.
 * Displaying Objective-C class references as their class names rather
   than `_OBJC_CLASS_$_` symbol names.
 * Displaying Objective-C string literals as `@"..."`.

This works best when used in conjunction with
https://github.com/bdash/bn-objc-extras as the reference counting runtime
calls add so much clutter.

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