Feature request

Is your feature request related to a problem? Please describe.
There is no official way to set the initial mode in copter. Plane and Rover got a parameter and start on INITIALIZE mode.
On Copter, STABILIZE is set by default. The current method to set an initialization mode is to rely on FLTMODE1.

But in case FLTMODE_CH = 0, FLTMODE1 isn't called and you are stick to

Hi, I got a problem similar to #804.

My bridge did not connect correctly.
I have followed the latest tutorial and build Apollo successfully today.
My apollo did not connect in the following step.

Launch bridge (inside docker container):
./scripts/bridge.sh

I would need to add sudo in order to start my bridge.sh.
After adding that, there was no information print out from the terminal.

void AStarExpansion::add(unsigned char* costs, float* potential, float prev_potential, int next_i, int end_x,  int end_y)
{
    .........
    if(costs[next_i]>=lethal_cost_ && !(unknown_ && costs[next_i]==costmap_2d::NO_INFORMATION))
        return;
    potential[next_i] = p_calc_->calculatePotential(potential, costs[next_i] + neutral_cost_, next_i, prev_potential);
     .......
}

Python users are used to using getters and setters to access properties of objects.
See for example #1687.
Such getters and setters are not implemented in the Webots Python API.
They could be easily added. See https://www.geeksforgeeks.org/getter-and-setter-in-python for reference.