add: Audio Info in NowPlayingPanel.cpp ; Includes: Samplerate, bits/sample, and codec

change: opengl dll for windows now is not included, cause it is too large
refactor: Spectrogram colors for bars are now in a Header (GradientPresetHeader.h), with accompaning methods

CMakeLists.txt

@@ -63,6 +63,7 @@ set(HEADERS
     src/gui/CoverArtWidget.h
     src/gui/SpectrogramWidget.h
     src/gui/GradientDialog.h
+    src/gui/GradientPresetHeader.h
     src/gui/EqualizerWidget.h
     src/gui/EqualizerPresetManager.h
     src/gui/FreqCurveWidget.h
@@ -87,10 +88,10 @@ set(HEADERS
     src/engine/encoder/StageBuffer.h
     src/engine/encoder/FfmpegGuards.h
     src/engine/encoder/SampleRateUtils.h
-    src/engine/encoder/CodecUtils.h        # new: pickSampleFormat/pickChannelCount/clampBitrate/ChannelLayoutGuard
-    src/engine/encoder/OutputPathBuilder.h # new: buildOutputPath
-    src/engine/encoder/DecoderPipeline.h   # new: input open + decoder context
-    src/engine/encoder/EncoderPipeline.h   # new: encoder + muxer + SWR + encode frame
+    src/engine/encoder/CodecUtils.h        
+    src/engine/encoder/OutputPathBuilder.h 
+    src/engine/encoder/DecoderPipeline.h   
+    src/engine/encoder/EncoderPipeline.h   
     # ffmpeg wrapper
     src/engine/ffmpeg/FormatContext.h
     src/engine/ffmpeg/CodecContext.h
@@ -131,7 +132,7 @@ target_include_directories(SubWave PRIVATE
     src/config
     src/controllers
     src/engine
-    src/engine/encoder   # covers CodecUtils.h, OutputPathBuilder.h, DecoderPipeline.h, EncoderPipeline.h
+    src/engine/encoder   
     src/engine/ffmpeg
     src/playlists
     src/gui