Gtirb

* Rename `elfSectionProperties` to `sectionProperties`, and remove
`peSectionProperties`.

* Use `.ascii` directive for partial strings.

* Add alternative PE assembler and linker commands.
* Use dedicated symbolic expression attributes.
* Add an option for assembler

* Added support for MIPS and ARM32
* Added support for MinGW for PE32+
* Fixed bad operand size in COMISS instructions
* Use PUBLIC entrypoint instead of EXPORT
* Handle linking to DRV files in PE32 binaries
* Change "isa" short option from -i to -I (-i is ir)
* Add special KUSER_SHARED_DATA symbol
* Handle ld-linux included as a required library
* Fix Intel syntax for vpgatherdd

* Add PE support.
* Remove null displacement offset warning.

* Add preliminary x86_32 support.