* glib2: Compile schemas per directory
By changing GSETTINGSSCHEMADIR during the build setup or on single tasks
or generators, the user may place schemas in various locations. Adding a
post build function for each of this location compiles all of them
instead of only one global directory.
* glib2: Notify user about failed schema compilation
* glib2: Demo schemas installed to multiple places
A new schema lacking lacking any enumerations was introduced. Installing
it isolated simplifies the generator creation to the essential
components demonstrated.
Task generators created from other task generators may be
skipped during partial builds. This change re-enables
install_task as a task attribute and provides a task
object with input and output nodes which can be re-used
by other tasks.
In some scenarios only some components of the glib2 tool are
necessary; for example, if intltool-merge is only used for
creating localized desktop files, it's not useful on Windows.
Rewrite the configuration function of the tools into several methods,
so that the 'funs' parameter can be used to only configure
specific programs from the tools.
