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The plugin should be in a lib that can be loaded by another process, it should not implement the process itself. I. e. there should not be a main() in your process and you should create a library rather than an executable.

This means remove your main and change

add_executable(Project_node 
        src/System/system.cpp 
        src/Gui/gui.cpp     
        ${MOC_SRC_H} 
        ${MOC_GUI_H}
)

for

add_library(rqt_project 
        src/System/system.cpp 
        src/Gui/gui.cpp     
        ${MOC_SRC_H} 
        ${MOC_GUI_H}
)

in your CMakeLists.txt. Note that rqt_project will correspond to an output library file named librqt_project.so. This in turn is loaded because in your plugin.xml you state: <library path="lib/librqt_project">, i. e. the postfix of the library path in plugin.xml must correspond with the target name of add_library in the CMakeLists.txt.

You can launch your plugin then via rgt_gui (it should appear there amongst the plugins) or standalone using a script like the one mentioned here: http://answers.ros.org/question/124706/how-to-run-a-newly-created-rqt-plugin/#191986

The plugin should be in a lib that can be loaded by another process, it should not implement the process itself. I. e. there should not be a main() in your process and you should create a library rather than an executable.

This means remove your main and change

add_executable(Project_node 
        src/System/system.cpp 
        src/Gui/gui.cpp     
        ${MOC_SRC_H} 
        ${MOC_GUI_H}
)

for

add_library(rqt_project 
        src/System/system.cpp 
        src/Gui/gui.cpp     
        ${MOC_SRC_H} 
        ${MOC_GUI_H}
)

in your CMakeLists.txt. Note that rqt_project will correspond to an output library file named librqt_project.so. This in turn is loaded because in your plugin.xml you state: <library path="lib/librqt_project">, i. e. the postfix of the library path in plugin.xml must correspond with the target name of add_library in the CMakeLists.txt.

You can launch your plugin then via rgt_gui (it should appear there amongst the plugins) or standalone using a script like the one mentioned here: http://answers.ros.org/question/124706/how-to-run-a-newly-created-rqt-plugin/#191986

<library path="lib/libfoobar">
  <class name="foo/Bar" type="foo::Bar" base_class_type="rqt_gui_cpp::Plugin">
    <description>
      A GUI plugin to view a sensor_msgs/Image topic in an foobar manner.
    </description>
    <qtgui>
      <group>
        <label>Visualization</label>
        <icon type="theme">folder</icon>
        <statustip>Plugins related to visualization.</statustip>
      </group>
      <label> blub image view</label>
      <icon type="theme">image-x-generic</icon>
      <statustip>A GUI plugin to view foobar topic in some manner.</statustip>
    </qtgui>
  </class>
</library>