Refactoring request: Remove redundant catch statement

[symbiogenesis]

In the event that a catch block simply throws, and it is the last catch block, or the only catch block, then it can be removed.

try
{
   DoSomething();
}
catch
{
   throw;
}
finally
{
   DoSomethingElse();
}

should become:

try
{
   DoSomething();
}
finally
{
   DoSomethingElse();
}

---

If there are multiple catch blocks, and then last one is redundant, then only remove the last one.

try
{
   DoSomething();
}
catch (SomeException ex)
{
   HandleException(ex);
}
catch
{
   throw;
}

should become:

try
{
   DoSomething();
}
catch (SomeException ex)
{
   HandleException(ex);
}

---

And for a try-catch block with only one empty catch block, and no finally block, then the entire thing should be removed

try
{
   DoSomething();
}
catch
{
   throw;
}

should become

DoSomething();