[FEATURE] Improved argument type watch in HTML debug backtrace
In the debug backtrace of method calls, this gives concrete
information about the actual argument values in case of being
boolean; and reveals the amount of array elements, if such.
An array is now presented as ``array|2|`` for example, if
it has two elements.
Boolean values are not longer only displayed as ``boolean``,
but as their concrete TRUE or FALSE value accordingly. Since
the color scheme stays the same, it can still easily be
distinguished from string values.