Implement determination of default plugin location for linux/unix systems
Merge branch 'origin/master'

Conflicts:
	source/examples/ViewerQt/main.cpp
	source/gloperate/source/plugin/PluginManager.cpp
Add option to set the search path for plugins
Implement automatic scanning for plugins, supporting an optional search string to omit loading non-plugin libraries
Adjust method names for PluginManager
Merge pull request #5 from hpicgs/plugin_system

Plugin system
Move TimePropagator to specific qt module
Merge branch 'master' of github.com:hpicgs/gloperate

Conflicts:
	source/examples/ViewerQt/main.cpp
Refactor capabilities
Add more capabilities
Move basic timer classes into directory base/
Add virtual time capability handling in glfw
Comment classes in gloperate-qt
Merge pull request #6 from hpicgs/glfw_timer

Add virtual time capability handling in glfw
Merge branch 'master' into comments
Add documentation for the capabilities
Move instance of TimePropagator into QtOpenGLWindow
Add changed flag to AbstractCapability and use it inside of the examples
Small changes and comments
Remove Viewport class (not needed)