Adds user manual entry for the new Preferences dialog.

v0.3/Preferences_V0.3.0.md

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+Preferences
+---
+The preferences dialog allows you to change settings that affect the way
+that sdrtrunk operates and displays decoded data.
+
+![Figure 1: Preferences Dialog](v0.3/images/Preferences_V0.3.0.png)
+
+**Figure 1:** Preferences Dialog
+
+Each section of the preferences dialog is detailed below.
+
+Decoder
+---
+#### JMBE Audio Library
+Use the **Change...** button to specify the location for the optional JMBE audio 
+library that can be used for decoding digital audio like P25 Phase 1 and 2.
+
+Display
+---
+Settings to change the way that decoded values are displayed in the application.
+
+#### Channel Events
+Choose the timestamp format that is used in the Events tab.
+
+#### Talkgroups
+Customize the display format for talkgroup values produced by each of the decoders.
+
+**Decimal** - Base 10 decimal format (0 - 9)
+**Hexadecimal** - Base 16 format (0 - 9 and A - F)
+**Formatted** - default format for the decoder (either Decimal or Hexadecimal)
+**Fixed Width** - when checked, adds leading zeros to make all of the displayed values have the same width
+
+File Storage
+---
+Customize the file system directories and locations used by sdrtrunk.  
+
+By default, a base folder **SDRTrunk** is created in your user directory and all
+other folders are created below that folder.  You can use the **Change ...## button
+to customize any of the locations.
+
+**Application Root** - base directory for all sdrtrunk generated data and logging folders 
+**Application Logs** - log files that are created each time the application runs
+**Event Logs** - event logs produced by each decoder channel when you enable event logging.
+**Playlists** - playlist configuration file(s)
+**Recordings** - all audio, baseband and MBE recordings are stored here
+**Screen Captures** - screen capture pictures created by the user
+**Streaming** - temporary streaming audio file queue.
+
+Source
+---
+Settings for application data sources like tuners and wideband recordings.
+
+#### Channel - Multiple Frequency
+The multiple frequency tuner source feature allows you to specify multiple frequencies
+to monitor for a system that uses rotating control channels.  The **Rotation Delay** value
+indicates the number of seconds that sdrtrunk should remain on a channel that has
+stopped decoding before moving to the next frequency in the list.  The application will
+continue to try each frequency in the list until it discovers an active signal
+to decode.
+
+#### Tuner Channelizer
+This setting allows you to choose which channelizer sdrtrunk should use.  The channelizer
+is used to breakup a wide signal that you normally see from a tuner into a number
+of smaller channels that are used by each of the decoders.
+
+**Channelizer Type** - choose between **Polyphase** and **Heterodyne**
+
+**Polyphase** is the default type and provides the best channelization with minimal to 
+no bleed over from adjacent channels.  
+
+**Heterodyne** is less processor intensive and may be appropriate for lower powered
+processors.  However, this channelizer does not provide the best filtering and
+some bleed over from adjacent channels can impact the performance of decoders.  This
+bleed over is only an issue if you have strong signals on adjacent channels next
+to the channel that you are decoding.
+