fig2plotly working with cone plotly function when coneplot matlab function is required

[gilbertogalvis]

This PR implement matlab coneplot function by using cone plotly function. Previously coneplot was implemented using mesh3d plotly function.

It is important too highlight that to use this modification it is necessary to set TreatAs optional parameter to 'coneplot'.

Example of usage:

load wind
xmin = min(x(:));
xmax = max(x(:));
ymin = min(y(:));
ymax = max(y(:));
zmin = min(z(:));
xrange = linspace(xmin,xmax,8);
yrange = linspace(ymin,ymax,8);
zrange = 3:4:15;
[cx,cy,cz] = meshgrid(xrange,yrange,zrange);
coneplot(x,y,z,u,v,w,cx,cy,cz,5);

fig2plotly(gcf, 'offline', false, 'TreatAs', 'coneplot');

Result looks as follow

link to chart-studio
https://chart-studio.plotly.com/~galvisgilberto/3830/#/