Stunner - signal name cannot be dynamic

The editor prevents the user to insert an expression containing mvel code:
e.g.
name-#

This is a really common usage pattern for signals!

Acceptance Criteria

Signal property in all signal events will support static, dynamic and combined expressions.

Allowed characters are

• a-z, A-Z, 0-9 and underscore "_"

The following expressions are accepted:

• static expressions
  • name
• dynamic expressions
  • # {var}
  • # {obj.property}
  • # {object2.method(var, object3.var)}
  • etc.
• combined expressions (connection of static and dynamic expression by hyphen "-", starting by static expression)
• staticExpression-# {dynamicExpression}

Nothing else is supported.