[WIP] Updates the sample adapters to natively use ReusableBuffers.

Refactors a MixerReader instance from the RealMixerSource so that it
can be reused for both real and complex data outputs.

Updates RealMixerSource to use refactored MixerReader and use a default
sample rate of 8 kHz.

Updates the ComplexMixer to use the refactored MixerReader.

Updates the FCD 1/2 tuners for compatibility with the new ComplexMixer.

Removes several unused classes.

src/main/java/io/github/dsheirer/sample/adapter/RealSampleAdapter.java

@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.sample.adapter;
+
+import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+
+public abstract class RealSampleAdapter extends AbstractSampleAdapter<ReusableBuffer>
+{
+    private ReusableBufferQueue mReusableBufferQueue;
+
+    /**
+     * Constructs a real sample adapter
+     *
+     * @param debugName to use for debug logging
+     */
+    public RealSampleAdapter(String debugName)
+    {
+        mReusableBufferQueue = new ReusableBufferQueue(debugName);
+    }
+
+    protected ReusableBuffer getBuffer(int size)
+    {
+        return mReusableBufferQueue.getBuffer(size);
+    }
+}