Catching exceptions not caught in event handler code

[divanchykhin]

This issue depends on issue #4

With respect to exceptions, we have to follow the model of Node.js. which seems to be the following:

• if exception is uncaught - it brings down the whole Node (but unlike .js - only one Node, and NOT everybody in the same process).
• we have to implement uncaughtException handler the same way .js does it - in particular, it will allow ignoring exceptions
  • I disagree with the rationale in Node.js doc on uncaughtException being bad - while it does stand for stateless stuff, it is all about the relative cost of losing the state vs risk of being in a bad state - in particular, if multi-level integrity checks are present (which they SHOULD be), chances of corruption being uncaught by other levels have been seen to be slim.
  • with respect to CPU-level exceptions (memory corruption etc.) - at least when safemem is on, they SHOULD NOT get to uncaughtException handler, crashing the whole process instead.

[divanchykhin]

This issue depends on issue #4