Since not all GUIs have a switch to toggle the tracing of the main CPU, add a monitor command that does that
Some Cocoa headers give compile errors if DEBUG is defined without a value. But VICE's --enable-debug configure-time switch does a #define DEBUG, so the Cocoa build was breaking
The assumption that console_log is not NULL does not hold. If a breakpoint has an associated command, when the breakpoint triggers the command is executed before the monitor window is restored, so console_log is null.
Be compatible with the "real" readline, in which the return value must be free'd with free()
src/console.h declares readline non-static, so it must be non-static here too otherwise it won't compile
Correctly check for emptiness of string
Also copy the dependencies of libraries to the bundle
Also display the "latched" value of the timer (the value where the countdown started)