build plugin: reload cmake targets if the cmake file API relies have been updated

Alexander Neundorfrequested to merge
neundorf/kate:CMakeReloadTargets into master

This patch makes the buildplugin reload the cmake targets fo projects which have been loaded using the cmake file API, when the reply directory of the file API is modified. It stops watching the reply directory if the project is deleted. For that a new signal TargetModel::targetSetDeleted(baseDir) has been added.

I'm actually not sure this is the best approach for Kate. Maybe a simpler menu entry "Reload current project" which would work for all projects, would better suit kate ?

Looking forward to hear your comments.

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