API: add `GDBDebugger >> getParameter:` and `setParameter:to:` ...to get / set GDB internal parameters such as prompt. The only complication here is that when a parameter is set by MI `-gdb-set` command, the `=cmd-param-changed' notification is not sent. This may or may not be a GDB bug. To make this transparent to `libgdbs` clients, intercept all `-gdb-set` commands and when sucessful, emit the event manually. This way, client may rely on value change notification (`GDBCmdParamChangedEvent`) to detect changes.

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#include <stdio.h>

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int factorial(int i) {

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	if (i == 1) {

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		return 1;

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	} else {

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		return i * factorial(i - 1);

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	}

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}

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int main(int argc, char **argv) {

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	int i = 5;

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	int f = factorial(i);

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	printf("factorial(%d) = %d\n", i , f);

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}