LoopDropZ 0.7.3

* HotKey Control:
I've added a global preference for hotkeys, so you can disable HotKeys
entirely, by putting this in your ini file:

use_hotkeys=false

I've also added a specific preference for Quit, "hotkey_quit", which will, by
default, be set to "{Esc}" (no quotes) internally. But if you add the
preference yourself, e.g..

hotkey_quit=^#!{F4}

It will now only activate on Ctrl+Win+Alt+F4. Note: if you add the preference
but leave it blank, it will revert to {Esc}.

The AutoIt hotkey assignments are a bit esoteric; more details here:

<https://www.autoitscript.com/autoit3/docs/appendix/SendKeys.htm>

Note: the "Esc" key should still work to quit LoopDropZ when it's at the
front, as it seems to be the default for AutoIt windows. Oops!

* Launch-with-list.
You can now use the "a" or "all" flag to have LoopDropZ launch and loop
the entire list (same as Ctrl+L or the Tray option) right off the bat.

This could be useful in a scenario where LoopDropZ has been employed to
loop an audio file, or group of audio files, which may at some time in
the future be updated.

Rather than load the file into memory and pass it to the Windows API to
loop, LoopDropZ reloads the files in the list afresh for each loop, even
if there's only one file, see.

If you are using this for announcements in your museum, you can now
update your audio file at will an LoopDropZ will loop the updated audio.
(yes, this was a feature request)