* [EAX] Fix effect GUID validation
Only NULL and REVERB was valid.
* [EAX] Fix default FX slot flags
EAX4 and EAX5 both sets to ENVIRONMENT.
* [EAX] Set default values for legacy FX slots in the initialization
* [EAX] Fix FX slot locking policy
Fail on attempt to load an effect or change a lock for EAX4 "set" call.
Unlock legacy FX slots on any EAX5 call.
* [EAX] Allow DEFER flag for "get" calls.
* [EAX] Make speaker configuration read-only
* [EAX] Initialize speaker configuration
* [EAX] Commit EAX source on a 3D source parameter call
Reference: EAX 4.0 Programmer's Guide
* [EAX] Commit EAX source on a 3D listener parameter call
Reference: EAX 4.0 Programmer's Guide
* [EAX] Commit source when it begins to play
Reference: EAX 4.0 Programmer's Guide
* Add EAX extensions (EAX 2.0-5.0, X-RAM)
* Comment out C++17 leftovers
* Remove everything related to patching
* Update alsoftrc.sample
* Rewrite integration
* Fix GCC compilation under Linux
* Always reset EAX effect properties when loading it into FX slot
The inverted atomic flag replaces test_and_set+clear with test_and_clear+set,
essentially inverting the flag status. This makes more logical sense for
flagging dirty state, which is less confusing than flagging clean state. The
one caveat is ATOMIC_FLAG_INIT (or default construction in C++20) initializes
the state to true rather than false.
