RustlerElixirFun: Calling Elixir from Rust

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Version 0.3.0 has been released.
It now has been thoroughly battle-tested by using it from within ArraysRRBVector. :blush:

Usage has become slightly simpler and less error-prone; on the Rust side an enum is now returned with the various possible results of a function call:

pub enum ElixirFunCallResult {
    /// The happy path: The function completed successfully. In Elixir, this looks like `{:ok, value}`
    Success(StoredTerm),
    /// An exception was raised. In Elixir, this looks like `{:error, {:exception, some_exception}}`
    ExceptionRaised(StoredTerm),
    /// The code attempted to exit the process using a call to `exit(val)`. In Elixir, this looks like `{:error, {:exit, val}}`
    Exited(StoredTerm),
    /// A raw value was thrown using `throw(val)`. In Elixir, this looks like `{:error, {:thrown, val}}`
    ValueThrown(StoredTerm),
    /// The function took too long to complete. In Elixir, this looks like `{:error, :timeout}`
    TimedOut,
}

This way, we can be sure that all edge cases are considered when you use it in your code.

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