Initial ELF structure modification support

Added some new accessor functions in for some members in elfobj_t, Which is an opaque type and should Never be accessd directly. Added Code to modify elf sections segments and symbols.

Alpha-v0.4

Added more general support for SCOP binaries (See: http://bitlackeys.org/papers/secure_code_partitioning_2018.txt)

Alpha 0.3 - Fixes for about a dozen parsing bugs

A very minor release fixing about a dozen or so parsing bugs. Stay tuned for a huge leap forward in the near future releases.

Alpha 1.1 - Just a half release. About a dozen bug fixes, more to come.

This is essentially the initial alpha release which has not undergone rigorous testing and still needs a proper regression suite in addition to more fuzzing and bug fixes.

Since the initial commit of the alpha release we fixed a dozen or so bugs found by contributors who were fuzzing the elfparse program. Not all bugs have been addressed yet, but that is the main focus of the efforts for the next minor release v0.2-alpha.