Member initialization scope calculation not sophisticated

[klemensschindler]

When initializing a member, it is possible to refer to members as well as constructor arguments.

The following things would enhance usability:

• Difference between members and constructor arguments should be clear in the code completion menu
• Constructor arguments should be displayed before members
• Preferably (nice to have) only initialized values can be used in expressions. This is not a must, certainly not at this point.