Add functions to get a `CGEventFlags` from a slice of `autopilot::Flag`

These two functions are copied from `autopilot-rs/src/key.rs` at
ab7ebc9fd8bc210717c0210aa20335ea9ceed200. I wanted to use the library
directly, but they're private functions.

I need this code in order to be able to convert the 'autopilot' `Flag`
type into `CGEventFlags`. I need a `CGEventFlags` because my media key
simulator, `dkess_press_key()` (an FFI function), requires a
`CGEventFlags`-typed value.

Needed to change the `from` function to a top-level function due to this
error:

    error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
       --> src/autopilot_internal.rs:213:1
        |
    213 | impl From<Flag> for CGEventFlags {
        | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl doesn't use types inside crate
        |
        = note: the impl does not reference any types defined in this crate
        = note: define and implement a trait or new type instead

Bringing the code into the project seemed to be the easiest way to
leverage the existing 'autopilot' work.

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