coff: Implement basic object parsing #4
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This adds basic Coff object parsing support to Zld. Coff is parsed for section headers and symbol table. Actually symbol table parsing is the only one which is complete right now. Section header parsing is ok, but need additional work to handle long names. Rellocations, line numbers, data etc are not read at all.
Contains some modified replicated code from std.coff which has to be made to upstream zig later.
The main purpose of this PR is to accelerate the development of zar.