metaprogramming

### Example
let unreachableProxy = "http://127.0.0.1:8888"
try:
  let client = newHttpClient(proxy=newProxy(unreachableProxy), timeout=1)
  var res = client.getContent("https://github.com")
  echo res
except:
  echo "Timed out"

Current Output

timeout variable is ignored, program stuck until default socket timeout will happen

Expected Output

Timed out a

Python 3.x uses _call_with_frames_removed to remove internal frames from tracebacks. I tried it in #1687, but couldn't get it to work; might be due to this Python issue.
Regardless, it would be good to remove those frames somehow.

Justification
It's much more common to see the code below:

Public Sub Foo()
    Dim i, j, k As Long
    'code
End Sub

than it is to see:

Public Sub Foo()
    Dim i As Long, j As Long, k As Long
    'code
End Sub

This is a very common pitfall. Example code in a MultipleDeclarations inspect

A lot of the Javadoc comments int the public API are missing documentation for things like parameters and return types (think @param and @return tags). In my opinion, the most glaring omissions of these details are in the metamodel docs, found in the subpackages of spoon.reflect.

For example, at the time of writing

Parent issue: #335
Every plugin must be able to use all properties to construct the exact PSI element being fed in to achieve isomorphism between Quote and Scope. To ensure that AST parsing and our quote-and-template system is robust, more testing is needed to increase stability and reliability.

Checklist for WhenExpression

• Destructure and make available all methods related to re