Feature/apdu null length returned (#285)

* Add APDU as NULL to get BACnet type lengths.

* Fix bacapp copy test to succeed

* fix BACnet REAL and DOUBLE decode

* Add unit test for NULL APDU encoding for length

* Add unit tests for bacapp context

* refactor host-n-port to hostnport.c module

* fix BVLC decoder

* additional unit testing for bacapp

* include bacdevobjpropref module in builds

* simplify bacapp snprintf to be able to return length

* adjust compiler for variable-length arrays

* fix bug found by scan-build

Authored-by: Steve Karg <skarg@users.sourceforge.net>

ports/pic18f6720/BACnet-Server.X/nbproject/project.xml

@@ -10,7 +10,20 @@
             <cpp-extensions/>
             <header-extensions>h</header-extensions>
             <sourceEncoding>ISO-8859-1</sourceEncoding>
+            <asminc-extensions/>
             <make-dep-projects/>
+            <sourceRootList>
+                <sourceRootElem>../</sourceRootElem>
+            </sourceRootList>
+            <confList>
+                <confElem>
+                    <name>default</name>
+                    <type>2</type>
+                </confElem>
+            </confList>
+            <formatting>
+                <project-formatting-style>false</project-formatting-style>
+            </formatting>
         </data>
     </configuration>
 </project>