[tools] Add ability to coredump from GDB directly #961
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By using GDB you can dump all volatile memories including heap and backup memories. This works even without an ELF file in case it is not at hand right away. To find the right ELF file later, the GNU build ID can also be extracted from the firmware.
This removes the copying of the CrashDebug binaries into the generated modm folder, instead you must provide them in your PATH.