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/Data/Makefile

@@ -0,0 +1,22 @@
+#
+# Makefile
+#
+# Makefile for Poco Data
+#
+
+include $(POCO_BASE)/build/rules/global
+
+objects = AbstractBinder AbstractBinding AbstractExtraction AbstractExtractor \
+	AbstractPreparation AbstractPreparator ArchiveStrategy Transaction \
+	Bulk Connector DataException Date DynamicLOB Limit MetaColumn \
+	PooledSessionHolder PooledSessionImpl Position \
+	Range RecordSet Row RowFilter RowFormatter RowIterator \
+	SimpleRowFormatter Session SessionFactory SessionImpl \
+	SessionPool SessionPoolContainer SQLChannel \
+	Statement StatementCreator StatementImpl Time
+
+target         = PocoData
+target_version = $(LIBVERSION)
+target_libs    = PocoFoundation
+
+include $(POCO_BASE)/build/rules/lib