* update to 5.12.4
* removed port qt5-modularscripts and split it functionality into more functions into qt5-base
* added qt_port_hashes.cmake for simpler upgrade.
* added optional VCPKG_QT_HOST_MKSPEC and VCPKG_QT_TARGET_MKSPEC to select QTs build mkspecs from a triplet
* qt_<config>.conf are now copied from the build dir instead from the port dir
* fixed freetype dependencies.
* cleanup of vcpkg_qmake scripts. No strange/unclear replacements anymore.
* introduced vcpkg_buildpath_length_warning
* changed directory layout of the qt5 installation executables and mkspecs a bit.

* [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

* Fix calls to _execute_process() when not in Download Mode

This reverts commit 65d4bc146bf7c1c21989b680497b1f6f9a09c967.

* [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

* added function vcpkg_fail_port_install to fail the portfile under requested circumstances and display a standarized failure message

* added always option.

* fix linux regressions

* bump control for ci tu rerun

* Use spaces instead of semicolons in the output

* Add prettify_command macro

* Move pretty_command macro to a separate file

* [vcpkg] Add vcpkg_check_feature, vcpkg_check_features

* [vcpkg] Remove vcpkg_check_feature

* [oniguruma,xtensor] Use vcpkg_check_features

* Add VCPKG_NUM_LOGICAL_CORES

* break out logic that retries running a command several times into its own function

* Parallelize icu

* fdlibm init

* fix links

* Fix different hashes creation with google host

* Move functions to script

* Fix documentation

* [vcpkg_from_git] Add SHA512 argument, switch to zip to better support Windows.

* [fdlibm] Trigger rebuild

* [vcpkg_from_git] Use FETCH_HEAD reference to support tags