* [portfile functions] Override execute_process() to accept ALLOW_IN_DOWNLOAD_MODE option
* [vcpkg install] Set VCPKG_DOWNLOAD_MODE when using --only-downloads option
* [vcpkg_find_acquire_program] Allow in Download Mode
* Don't stop when build fails for a package
* Download sources for all packages in dependency graph
* Improve output messages
* Enable acquiring MSYS packages in download mode
* Documentation
* Update documentation
* execute_process() always fails on Download Mode
* Regenerate docs and fix formatting
* Run clang-format
* Use _execute_process on vcpkg_from_<source> helpers
* [GraphicsMagick] bug-fix: image files won't load
GM (GraphicsMagick) was failing to load image files, notably PNG or JPEG
images, as it was being compiled with support for 'GraphicsMagick
Modules'. These are files with names specific to GM, and of the format,
'IM_*.dll'. vcpkg's install process was not setting these up. This
patch makes sure that when GM is built, it embed's GM's own
image-loading code into graphicsmagick.dll.
* [vcpkg_extract_source_archive_ex] Add PATCHES argument
* [openmesh] Use direct download instead of gitlab
* [blaze] Use PATCHES argument
* [graphicsmagick] Use vcpkg_extract_source_archive_ex
This enables multiple archives to be correctly expanded into the same build tree. Previously, the second archive will detect as being already extracted since 'src' exists.
