Implement DWARF parsing in Linux

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This would add the ability to read symbols from processes with debug information on Linux through LinuxProcessHandle::GetSymbolName and LinuxProcessHandle::GetSymbolAddress.

Depending on how complex this is, might need another dependency (such as libelfin which would probably also replace the ELFIO dependency) or we'd have to implement parsing manually based on the spec, if it's simple enough.

DWARF specification: http://www.dwarfstd.org/doc/DWARF5.pdf