remove ui namespace which is not really used, move CameraData in camera_modes.h to avoid the inclusion of canva.h

src/node_dialog_picker.cpp

@@ -25,7 +25,7 @@ void NodeColorPicker::init()
 void NodeColorPicker::draw()
 {
     NodeBorder::draw();
-//    glm::vec3 rgb = glm::vec3(ui::Canvas::I->m_current_brush.m_tip_color);
+//    glm::vec3 rgb = glm::vec3(Canvas::I->m_current_brush.m_tip_color);
 //    glm::vec3 hsv = convert_rgb2hsv(rgb);
 //    m_slider_h->m_value.x = hsv.x;
 //    m_slider_s->m_value.x = hsv.y;