PluginXmlFunctionalTest: cleanup inline test data
extract ExtensionPointDocumentationProviderTest
PostfixTemplateDescriptionNotFoundInspectionTest: rename/move test data
PluginXmlDomStubsTest: move test data
Devkit tests: add @TestDataPath
fix "already disposed" from EditorNotifications
EA-55808 - ISE: ComponentManagerImpl.getPicoContainer
use ensureValid (EA-56464, EA-56467)
TemplateManager -> service
Cleanup postfix templates
Delete dummy semicolon after postfix template expansion
Reformat postfix templates tests
Simplify return postfix template
Do not delete inserted semicolon for statement-based postfix templates