"enter" key in mesh and model creation UI

[Angus Yeh]

If user press "enter", it will trigger "save" and brings out the dialog,

Maybe move this focus away so people don't get confused.

(issue discovered by Eylem)

[Angus Yeh]

Fix Issue #89 where Enter key will cause action (unexpected by user) in mesh/t2data creation dialog.

→ <<cset c27357b07054>>