Disassembler: Add an stderr message for unknown ACPI tables.

An additional error message for tables that are not supported,
so that it appears on the console.
Resource Mgr: Prevent infinite loops in resource walks.

Add checks for zero-length resource descriptors in all code
that loops through a resource descriptor list. This prevents
possible infinite loops because the length is used to increment
the traveral pointer and detect the end-of-descriptor.
Debugger: Allow zero arguments to resources command.

Allows invocation of resources command with no arguments. This is
interpreted as "display resources for all devices".