remove MVerb, IIR and Speex - Spice86 Core now uses external dependen…

LICENSE

@@ -202,8 +202,11 @@
    limitations under the License.
 
 
-   Third-party libraries are licensed as followed:
-   - Adlib Gold: Personal permission granted by John Novak from DosBox Staging
-   - Nuked-OPL3: LGPL-2.1
-   - iir1: MIT
-   - YM7128B_emu: BSD 2-Clause
+   Third-party components retain their respective licenses:
+   - SDL-derived audio backends: zlib; see LICENSE.SDL and CREDITS.SDL.
+   - DOSBox Staging-derived audio code: GPL-2.0-or-later; see
+     LICENSE.DOSBOXSTAGING and individual source headers.
+   - Iir1.Net and upstream iir1: MIT; the dependency package includes both
+     license notices and its third-party notice.
+   - TAL-NoiseMaker chorus code: GPL-2.0; see individual source headers.
+   - Master Tom Compressor: BSD-style terms; see Compressor.cs.

README.md

@@ -513,7 +513,7 @@ dotnet test tests/Spice86.Audio.Tests
 
 ## License and Credits
 
-The `Spice86.Audio` library itself is licensed under the [Apache License 2.0](LICENSE).
+Project-authored `Spice86.Audio` code is licensed under the [Apache License 2.0](LICENSE). Ports and dependencies retain the licenses listed below.
 
 It incorporates C# ports of the following third-party components:
 
@@ -523,17 +523,13 @@ It incorporates C# ports of the following third-party components:
 - Full thanks to the SDL team for their outstanding cross-platform multimedia library.
 
 ### DOSBox Staging
-- **License:** [GNU GPL v2.0](LICENSE.DOSBOXSTAGING)
-- The mixer architecture, `RWQueue<T>`, `AudioFrame`, chorus engine (TAL-NoiseMaker integration), noise gate, MVerb reverb, compressor, and resampling pipeline are all faithful ports of DOSBox Staging's audio subsystem (`src/audio/`, `src/utils/rwqueue.*`).
+- **License:** [GNU GPL v2.0 or later](LICENSE.DOSBOXSTAGING)
+- `RWQueue<T>`, `AudioFrame`, shared audio configuration types, the chorus engine, noise gate, and compressor are ports of DOSBox Staging's audio subsystem (`src/audio/`, `src/utils/rwqueue.*`).
 - Full thanks to the DOSBox Staging team and the original DOSBox team.
 
-### IIR Filters (iir1)
-- **License:** MIT / GPL v3 (see [`src/Spice86.Audio/Filters/IirFilters/LICENSE`](src/Spice86.Audio/Filters/IirFilters/LICENSE))
-- Port of [iir1](https://github.com/berndporr/iir1) by Vinnie Falco (original DSPFilters) and Bernd Porr.
-
-### Speex Resampler (libspeex)
-- **License:** BSD-style (see libspeex source headers)
-- Port of the Speex resampler by Jean-Marc Valin and the Speex project.
+### Iir1.Net / iir1
+- **License:** MIT; the [`Iir1.Net`](https://github.com/codengine/Iir1.Net) package includes its own license and the preserved upstream iir1 license.
+- `NoiseGate` uses `Iir1.Net`, a managed port of [iir1](https://github.com/berndporr/iir1) by Vinnie Falco and Bernd Porr.
 
 ### TAL-NoiseMaker (Chorus & DCBlock)
 - **License:** [GNU GPL v2.0](https://www.gnu.org/licenses/gpl-2.0.html)
@@ -543,7 +539,4 @@ It incorporates C# ports of the following third-party components:
 - **License:** BSD-style (see `Compressor.cs` header)
 - `Compressor` is a port of Thomas Scott Stillwell's "Master Tom Compressor" JSFX effect.
 
-### Additional contributors
-Work from Patrick Kunz, Martin Eastwood, and John Novak has also been ported. See individual source file headers for details.
-
-Please see the respective LICENSE files at the root of this repository for the full license texts.
+See the linked license files, dependency package notices, and individual source headers for the applicable terms and attribution.

src/Directory.Build.props

@@ -16,7 +16,7 @@
 	</PropertyGroup>
 	<!-- Nuget package info-->
 	<PropertyGroup>
-		<Version>11.4.0</Version>
+		<Version>11.5.0</Version>
 		<PackageReleaseNotes>
             <![CDATA[
             # Release Notes - https://github.com/OpenRakis/Spice86/wiki/Spice86-v11.1-release-notes

src/Directory.Packages.props

@@ -4,6 +4,7 @@
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
   </PropertyGroup>
   <ItemGroup>
+    <PackageVersion Include="Iir1.Net" Version="1.0.0" />
     <PackageVersion Include="Spice86.Shared" Version="11.1.0" />
     <PackageVersion Include="FluentAssertions" Version="8.4.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />