Doc++
package: remove superfluous character.
Install and find debug libraries with "-d" suffix.

Makes it possible to have both debug and release libraries installed. If
both libraries are present when finding the package, proper version is
used based on what configuration is used in depending project.
Install also debug plugins to different location.

Static plugins have "-d" suffix similarly to normal libraries (so they
can be easily found using existing methods for libraries), dynamic
plugins are installed to different directiories, because their filename
must remain the same.

This commit modifies corrade_add_plugin() API, all depending projects
must be updated to specify both debug and release install dir.
package: added release PKGBUILD.

This package installs both debug and release libraries.