Add rudimentary PLH support

[arlomedia]

When sending through TCP, OSC 1.0 uses a packet length header (PLH) (four bytes at the start of outgoing data) to indicate to the receiver how long the packet will be. The current TCP transport in JavaOSC doesn't add this PLH to outgoing data, so other OSC-compliant apps won't process the data correctly; and it doesn't read this PLH from incoming data, so it won't process the data from other OSC-compliant apps correctly.

This PR correctly adds the PLH to outgoing data. For incoming data, it simply discards the PLH. A more complete solution would use the PLH to correctly process incoming OSC messages that are split across multiple TCP packets.

[daveyarwood]

I took a quick stab at testing this, but it looks like the tests are failing when I run mvn install:

[ERROR] Failures:
[ERROR]   OSCPortTest.testBundleReceivingTCP:604->testBundleReceiving:586->assertMessageReceived:331->assertEventuallyTrue:98 Message was not received.
[ERROR]   OSCPortTest.testLowLevelBundleReceivingTCP:655->testLowLevelBundleReceiving:628->assertPacketReceived:351->assertEventuallyTrue:98 Packet was not received.
[INFO]
[ERROR] Tests run: 268, Failures: 2, Errors: 0, Skipped: 0

NOTE: There were also a couple of build errors before this, which I was able to fix by adding this import:

import com.illposed.osc.transport.NetworkProtocol;

in the following files:

• OSCSerializer.java
• OSCSerializerAndParserBuilder.java