Add support for serving ghc-debug requests from a linux coredump

Introduces a python script that can interpret the memory of a Haskell process using just debug symbols. This allows you to start a ghc-debug server from a linux core dump.

Introduces the ghc-debug-dumpcore utility to make this more convenient.

added 42 commits

• 055c9abb...2541e77d - 41 commits from branch master
• bbba327c - gdb coredump support

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