[Oberon] Realloc function and simulating continue and break in Oberon-07 loops

[Skulski, Wojciech]

Chris:

> A similar capability has been implemented in Gardens Point Component Pascal (i.e. Oberon-2+ for .NET and JVM). Refer to Section 4.6 "Extensible arrays: the vector type" in the release notes:

I believe that such extensions can be more easily implemented under Extended Oberon by Andreas, than under Oberon-07 by Wirth. Extended Oberon supports open arrays.

https://github.com/andreaspirklbauer/Oberon-extended

Wojtek