add ErlangEngine
add IEngineInput
work on engine classes
hide model classes from other plugins (except the api)
fix dependencies from tracing to model
fix dependencies from dialyzer to model
fix dependencies from test_support to model
start removing deps from ui to model
create SearchCoreUtil
fix dep for test_support
wip SearchUtil
move search api classes to model.api
move OpenResult to model.api
move project properties classes to model.api
move ModuleLineFunctionArityRef to module.api
remove backend.api project, is not needed
moved api from model to model.api
simplify stuff in PluginUtils
inline PluginUtils
add model.createElementDelta