added basic 2D annotation tool
added static files for the 2D annotation tool support
enabled annotation URL
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
Merge branch 'master' into annotation
improved documentation structure and added content to technical documentation section