New target description + moving target stuff under "framework"

Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".

wa/framework/configuration/__init__.py

@@ -1,2 +1,19 @@
-from wa.framework.configuration.core import settings, ConfigurationPoint, PluginConfiguration
-from wa.framework.configuration.core import merge_config_values, WA_CONFIGURATION
+#    Copyright 2013-2016 ARM Limited
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from wlauto.core.configuration.configuration import (settings,
+                                                     RunConfiguration,
+                                                     JobGenerator,
+                                                     ConfigurationPoint)
+from wlauto.core.configuration.plugin_cache import PluginCache