Updates framework to support automated framework subclasses

All framework classes have been renamed to use the SihnonFramework_ prefix.
The class autoloader now looks for subclasses of the framework classes in the Sihnon_Lib directory, and
automatically creates them if they don't exist. The autoloader correctly creates interfaces and abstract
classes as needed, by using reflection to check the type of the parent class.
All references to classes within the framework now use the Sihnon_ prefix.
The PluginFactory supports multiple scan directories, and will search both the framework and subclass class
tree to find candidate plugins.

source/lib/SihnonFramework/Exceptions.class.php

@@ -0,0 +1,24 @@
+<?php
+
+class SihnonFramework_Exception extends Exception {};
+
+class SihnonFramework_Exception_NotImplemented         extends Sihnon_Exception {};
+class SihnonFramework_Exception_MissingDefinition      extends Sihnon_Exception {};
+
+class SihnonFramework_Exception_DatabaseException      extends Sihnon_Exception {};
+class SihnonFramework_Exception_DatabaseConfigMissing  extends Sihnon_Exception_DatabaseException {};
+class SihnonFramework_Exception_DatabaseConnectFailed  extends Sihnon_Exception_DatabaseException {};
+class SihnonFramework_Exception_NoDatabaseConnection   extends Sihnon_Exception_DatabaseException {};
+class SihnonFramework_Exception_DatabaseQueryFailed    extends Sihnon_Exception_DatabaseException {};
+class SihnonFramework_Exception_ResultCountMismatch    extends Sihnon_Exception_DatabaseException {};
+
+class SihnonFramework_Exception_ConfigException        extends Sihnon_Exception {};
+class SihnonFramework_Exception_UnknownSetting         extends Sihnon_Exception_ConfigException {};
+
+class SihnonFramework_Exception_CacheException         extends Sihnon_Exception {};
+class SihnonFramework_Exception_InvalidCacheDir        extends Sihnon_Exception_CacheException {};
+class SihnonFramework_Exception_CacheObjectNotFound    extends Sihnon_Exception_CacheException {};
+
+class SihnonFramework_Exception_InvalidPluginName      extends Sihnon_Exception {};
+
+?>