Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/ApacheConnector/Makefile

@@ -0,0 +1,26 @@
+#
+# Makefile
+#
+# Makefile for ApacheConnector
+#
+
+include $(POCO_BASE)/build/rules/global
+
+SYSFLAGS += -I/usr/include/apache2 \
+	-I/usr/include/apr-1.0 -I/usr/include/apr-1 -I/usr/include/apr-0
+
+ifeq ($(OSNAME),Darwin)
+SHAREDLIBLINKEXT = .so
+DYLIB += -flat_namespace -undefined suppress
+endif
+
+objects = ApacheRequestHandlerFactory  \
+	ApacheServerRequest ApacheServerResponse \
+	ApacheStream ApacheConnector ApacheChannel \
+	ApacheApplication ApacheChannel
+
+target         = mod_poco
+target_version = 1
+target_libs    = PocoUtil PocoNet PocoXML PocoFoundation
+
+include $(POCO_BASE)/build/rules/dylib