Gallopsled / pwntools / 2047

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Fix chunked reading of ELF files (#865)

* Fix chunked reading of ELF files

This introduces a new dependency on 'intervaltree', which is used
to automatically select segments which are relevant for a given
virtual-address range.

This also introduces a new ELF.memory attribute, which is the tree
of memory ranges, which point at the segment objects that describe
the memory range.

These are recalculated when ELF.address is adjusted, and we have
tests for that.

This also optimizes some of the other routines to avoid the wrapped
file-seeking, and to just use the mmap.

* Rewrite install scripts to use more modern versions of binutils

* Load segments in file-order, chop any overlaps

58 of 58 new or added lines in 1 file covered. (100.0%)

6943 of 12432 relevant lines covered (55.85%)

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