Update OpenAL Soft and allow seamless changing of the output device

[ACrazyTown]

This PR adds bindings and implements OpenAL Soft's reopenDeviceSOFT and ALC_SOFT_system_events extension. In order to take advantage of this functionality, I had to update OpenAL Soft, which required forcing latest hxcpp (git, until there's a new stable release). New versions of OpenAL Soft require the C++17 standard and current hxcpp doesn't seem to have an official way to use it. (Maybe it could be done via compilerflags in the Build.xml?)

With these changes, Lime will automatically listen to changes to the default audio output device and switch playback to those devices seamlessly. Also reopenDeviceSOFT allows for manually switching the output device in the app.

This is currently a draft, I'm waiting for a new hxcpp release and a new stable OpenAL Soft release (which should be sometime soon!), as well as figuring out a few other things. I'm opening this right now for discussion and feedback

Currently I only tested it on Windows x64 C++ (I've also had it working on Hashlink but ever since I've merged this change into 9.0.0-dev I keep getting a strange and seemingly unrelated error: FATAL ERROR : Invalid signature for function lime@hl_cairo_get_matrix : PDOiOiB_iiii__OiOiB_iiii_ required but PDOdddddd__Odddddd_ found in hdll). I will try getting the changes to work on other targets as soon as I figure out HL & Neko.

Closes #1515, openfl/openfl#2642

[player-03]

I've also had it working on Hashlink but ever since I've merged this change into 9.0.0-dev I keep getting a strange and seemingly unrelated error: FATAL ERROR : Invalid signature for function lime@hl_cairo_get_matrix : PDOiOiB_iiii__OiOiB_iiii_ required but PDOdddddd__Odddddd_ found in hdll

Try lime rebuild hl to bring your hdll up to date.

[ACrazyTown]

Try lime rebuild hl to bring your hdll up to date.

I've done that, tried doing a clean rebuild of both lime and my testing project. I keep getting the same error. Could this commit 71442d0 be related? It doesn't seem to be in 9.0 branch

[player-03]

Oh yeah, if you don't have that merged, you'll need it. Edit: ok, merged into 9.0.0-Dev. You can pull from there.

[ACrazyTown]

Okay, I think I did the merge right. Hashlink seems to be fixed and working fine now!

[ACrazyTown]

I've gotten Mac to build and work!

I only have Linux, Android & Neko left to figure out, though CI for them will always fail because it uses an older hxcpp version

[ACrazyTown]

Tested out Linux & it seems to work. I assume Android would also work with just an updated config but I don't know how I'd even test that... Neko seems to crash whenever it tries to dispatch the callback, I'm assuming it's threading related. I'm not sure what the alternative to hxcpp's gc_set_top_of_stack and hl's hl_register_thread would be on Neko.