fix init of erlang engine
small fixes
prepare v0.28.1
fix NPE when creating project
update changelog
v0.28.1
v0.28.1
add (partial) xtend-tools library (no RxJava and Loggers)
update plugin manifests
create model cache on request
1300 - builder traverses all source dirs looking for .app.src and modules
1303 - autodetect source directories
optimize builder refresh output dir
detailed externals model and icons
simplified IErlElement interface
add icons for macros, records
edoc: properly detect typespec before function
allow typespec with specified module
workaround for slow input in console
fix typespec tests