…rences

We need to separate description of the dependency itself --
which places a bound on when particular objects can be
destroyed -- from the syntax.
In particular, the syntax specifies a relationship between
two objects, but that relationship is not always a
lifetime dependency itself (because of "copied" dependencies).

Also, fix the proposed syntax for properties

…bling proposal.

Changed `StorageView` and `BufferReference` to `Span` to match the si…

- Dependent parameters
- Dependent properties
- Conditional dependencies
- Immortal lifetimes
- Depending on immutable global variables
- Depending on an escapable `BitwiseCopyable` value
- Depending on an escapable `BitwiseCopyable` value

Remove Lifetime Dependencies for Computed Properties

Remove Lifetime Dependencies between arguments

- Value component lifetime
- Abstract lifetime components
- Protocol lifetime requirements
- Structural lifetime dependencies

Add several new sections

Add dependent parameters, immortal dependencies, and 'selfDependsOn'.

Update and cleanup the grammar.