add parser files
improve grammar
add do_activity, defer, terminate, join, choice, junction, merge, fix regions,
time expression, event declarations and using
after full time expr, relocate transition syntax
finish grammar and tests
support for flags error locations, errors for duplicate name
update syntax to nitra fixes
fix Events and Actions in parser, improve junction guards and relocate grammatic
work on parser ast conversion
parse pseudo states
complete pseudo state parsing
parse transitions
FindElem function
timed events
work on relocate transitions parse
complete relocation transitions and submachine
fix warnings
parse region
tree converter first version complete