[loc] improve Traditional Chinese translation

* Closes pbatard#413

[misc] update MinGW build chain for msys2

* Use autoconf and automake 1.14
* reinstate parallel build flags
* Also fix MinGW warnings and errors

[core] fix write error when using non sector aligned DD images

* Closes pbatard#410

[vhd] fix VHD detection on Windows 7

* Revert to using strstr
* Also fix a potential issue with GetTextExtentPoint

[ui] more UI improvements

* Automatically position the advanced button
* Improve UI display for some locales
* Small Windows 7 improvements

[internal] enable ALPHA/BETA from configure

* Pass --enable-alpha or --enable-beta to configure/_release.sh

[core] add support for additional VHD drivers

* Closes pbatard#407

[loc] update translations for 1.5.0 UI

[core] fix a crash when an image is selected with no target device

* Closes pbatard#405

[iso] fix sanitization of paths during ISO during extraction

* Also add sanitization for Syslinux downloaded content
* Also factorize printout of extracted file
* Closes pbatard#397