Merge branch 'prepareAssimpPlugin' into 'master'

PluginCollection-FilePlugins/Plugin-Assimp/AssimpPlugin.cc

PluginCollection-FilePlugins/Plugin-Assimp/AssimpPlugin.hh

...ollection-FilePlugins/Plugin-Assimp/AssimpPluginCommon.hh

PluginCollection-FilePlugins/Plugin-Assimp/AssimpPluginT.cc

PluginCollection-FilePlugins/Plugin-Assimp/CMakeLists.txt

...lePlugins/Plugin-Assimp/widgets/AssimpLoadOpionsWidget.cc

...ePlugins/Plugin-Assimp/widgets/AssimpLoadOptionsWidget.hh

...n-FilePlugins/Plugin-Assimp/widgets/AssimpOpionsWidget.cc

...-FilePlugins/Plugin-Assimp/widgets/AssimpOptionsWidget.hh

...-FilePlugins/Plugin-Assimp/widgets/AssimpOptionsWidget.ui

...lePlugins/Plugin-Assimp/widgets/AssimpSaveOpionsWidget.cc

...ePlugins/Plugin-Assimp/widgets/AssimpSaveOptionsWidget.hh