#2518 P25P1 LSM Decoder enhancements. (#2523)

* Uses same shared architecture and symbol processor pattern as other C4FM decoders.
* Adds soft symbol processing and sync detection.
* Removes RRC filter and replaces with improved channel filter.
* Viterbi soft symbol decoding with demodulator reliability weighting
* Improved sync reacquisition in low SNR
* Improved handling for phase wrapping and interpolation
* NAC Tracker updated to track by NAC count
* Native buffers returning partial buffers
* Message processor uses only valid LDU1 words
* Reduced phantom TDU messages
* Tuner/Channe frequency error corrections don't reset the symbol trackers and fix possible divide by zero error
* LSM timing error detector now updates per symbol block size instead of sample buffer size - faster convergence
* New unit tests
* Resolves several issues, including a lagging sync detect offset issue in the recently updated P25P1 C4FM decoder.
* Consolidate filter designers for each protocol back into the FilterFactory class.
* DMR, P25 Phase 1 C4FM and LSM, and P25 Phase 2 decoders design the baseband filter once and share the taps across the I and Q filters.

Co-authored-by: denny <dennis.sheirer@gmail.com>

src/main/java/io/github/dsheirer/buffer/FloatNativeBuffer.java

@@ -100,8 +100,10 @@ public class FloatNativeBuffer extends AbstractNativeBuffer
                 throw new IllegalStateException("No more samples");
             }
 
-            float[] chunk = Arrays.copyOfRange(mInterleavedComplexSamples, mBufferPointer, mBufferPointer + BUFFER_SIZE * 2);
-            mBufferPointer += BUFFER_SIZE * 2;
+            //The final chunk holds the remaining samples, so that it isn't padded with zero valued samples
+            int end = Math.min(mBufferPointer + BUFFER_SIZE * 2, mInterleavedComplexSamples.length);
+            float[] chunk = Arrays.copyOfRange(mInterleavedComplexSamples, mBufferPointer, end);
+            mBufferPointer = end;
 
             return SampleUtils.deinterleave(chunk, getTimestamp());
         }
@@ -125,8 +127,10 @@ public class FloatNativeBuffer extends AbstractNativeBuffer
                 throw new IllegalStateException("No more samples");
             }
 
-            float[] chunk = Arrays.copyOfRange(mInterleavedComplexSamples, mBufferPointer, mBufferPointer + BUFFER_SIZE * 2);
-            mBufferPointer += BUFFER_SIZE * 2;
+            //The final chunk holds the remaining samples, so that it isn't padded with zero valued samples
+            int end = Math.min(mBufferPointer + BUFFER_SIZE * 2, mInterleavedComplexSamples.length);
+            float[] chunk = Arrays.copyOfRange(mInterleavedComplexSamples, mBufferPointer, end);
+            mBufferPointer = end;
 
             return new InterleavedComplexSamples(chunk, getTimestamp());
         }