YASGUI: Display Point in Map plugin

[ludovicm67]

Points are not shown properly in the Map plugin yet.

[ludovicm67]

The openlayers-element library lacks of support of POINT in the WKT element.
I created an issue for this here: openlayers-elements/openlayers-elements#149

I implemented a workaround solution using marker icon, but we can not display any title or so.
I created another issue for this here: openlayers-elements/openlayers-elements#150

So I will quickly release the workaround solution, so that people can already see the points on the YASGUI Map plugin as they would expect ; the support of the title will be something that will come once it's supported in some way by the openlayers-elements library.