Added base diagram profile style for showing terminal names on diagrams

Previously there has been an implementation for showing terminal names
in the symbol editor (SymbolTerminalNameStyle). This implementation is
for showing symbol instance terminal names on modelling diagrams
containing symbol instances. The names are positioned outside the
current symbol's bounding box.

ConnectionPointNameStyle also employs the new TextNode automatic text
flipping feature added in #7112.

refs #7107

Change-Id: Icf4709bf115a9c25b894192d186c6ce514cc0d29