Changes

Adopt to GlueGen commit 952e0c1f83c9e0583a97d39988a6ba1428911c8c

Fix file mods in make/config

Use GlueGen's SecurityUtil.doPrivileged(..) instead of AccessController, remove dead code

ALExtImpl: Remove unused imports

Sound3d.Context: destroy() shall only 'null' thread-local context if this is current; Expose hasALC_thread_local_context to avoid double checks

Add OpenAL extension AL_SOFT_events using userParam ALCcontext as key for GlueGen JavaCallback

https://openal-soft.org/openal-extensions/SOFT_events.txt

ALAudioSink: Utilize AL_SOFT_events if available, i.e. use callback for released buffer count instead of polling

With wait == true, we simply wait until enough buffers have arrived,
otherwise take what we got - both w/o polling and querying the alSource.

GlueGen cfg files: Remove now unused import java.security.AccessController

ALContextKey.equals(): Use cached nativeAddress of other item as well.

ALAudioSink.destroy(): Shutdown alEventCallbackSOFT properly (only if hasAL_SOFT_events, 1st disable all events); growBuffers(): No pre-condition exception for hasAL_SOFT_events

AL_SOFT_events: Define 'ALCcontext` as `UserParam` type for more clarity

AudioSystem3D.checkAL*Error(): Close single quote in error message

ALAudioSink.dequeueBuffer(..): AL_SOFT_events cumulated released buffers is 'sometimes wrong'. Workaround: Query released buffers after receiving event and use minimum.