* Update pacman to latest version for performing the AppVeyor core
update instead of explicitly referencing the core packages. Missing
references would cause the just upgraded pacman to detect a still
required core update in ci-build script, where it is supposed to
perform a regular update instead.
* Enable downgrades in ci-build script and AppVeyor so package versions
removed from pacman repositories are properly reverted.
* Install git as required by ci-build script.
* Only build packages that are actually present in source tree.
This should fix detection of renamed package folders, including case
sensitivity changes.
* Fix case sensitivity of Bintray account names.
Bintray accounts are now properly referenced in lowercase, and compared
without case sensitivity against the GitHub account for enabling deployment.
* Initialize target list when converting lines to array.
A pacman repository is now generated with built packages, and exported by
AppVeyor to Bintray. Similar export can now be implemented for Drone, and
services other than Bintray can also be used.
* New implementation for detection of changed recipes.
This is done by listing files changed since upstream master. When the list is
empty (e.g. current branch is master itself), changes from latest commit are
built instead.
* Merge dependency installation and actual build into one single makepkg call.
Extracting sources normally for each architecture on actual build should fix
patches getting applied twice for MINGW packages.
* Use --cleanbuild in makepkg call so MINGW packages using a common build
directory across different architectures always rebuild for each.
* Use --rmdeps in makepkg call so missing depends/makedepends can be detected
for subsequent recipe builds.
* Source code refactoring.
