In some cases, like when given

```cpp
std::vector<char>* str =
reinterpret_cast<std::vector<char>*>(0x1234458);
CHECK(*str == std::vector<char>());
```

reconstructing the expression to report it would cause another fatal
error. Instead we just put together an AssertionResult without
reconstructing the expression fully.

This should fully fix #810

Some versions of MinGW do not support enough of Win32 API to let us work
with SEH, so SEH is now MSVC only (+ configurable toggle).

Also made use of gmtime_s MSVC only (as oposed to Windows only).

Fixes #805

Because the signal changes were in a different branch from the windows.h
related changes, the SEH handling code included the header directly.

Fixes #803

Should fix #796

* Compilation warnings fix

* Removed unused argument from reportFatal function

This means that all tabs used in indentation are now 4 spaces and that
there should be no more trailing whitespace.

Ill also look into creating a pre-commit hook that will prevent this
from happening in the future.

Fixes #105

This fixes the case when we pass signal to previously registered
handler, and it needs to transform the signal into different one.

Still problematic: What if the signal handler we replaced does not
terminate the application? We can end up in a weird state and loop
forever.

Possible solution: Deregister our signal handlers, CALL the previous
signal handler explicitly and if control returns, abort. This would
however complicate our code quite a bit, as we would have to parse the
sigaction we delegate to, decide whether to use signal handler or signal
action, etc...