get rid of fornax-oaw-m2-plugin & migrate to new workflow

[cdietrich]

code still uses fornax-oaw-m2-plugin.
we should consider moving to new workflows everywhere and use maven-exec
plugin to generate dsls. (as xtext new project wizard creates projects)

[cdietrich]

fornax repo is down right now. already reported it

[cdietrich]

fornax repo has broken signature. have reported that.

[cdietrich]

pr'ed #266 for the obsolte fornax maven repo and pulling newer version from maven central

[cdietrich]

new workflow comes more "urgent" eclipse/xtext#1669

am not sure if there is a proper replacement for StatefulLexerFragment

[cdietrich]

this also prevent from moving the bundle dependency from manifest to build.properties

main problem for moving to new workflow is: the stateful lexer fragment has no replacement unfortunately

[cdietrich]

maybe we can as an immediate solution port to new workflow and use fragment adapter

[cdietrich]

also the manifest deps to compile time only stuff is bad

[cdietrich]

with the removal of orbit this becomes worse and worse cause the xpand dependency

[cdietrich]

this is done