Replace PNG icons using SVG files

[danieldanielecki]

At the moment it's not possible to use .svg files in the icon prop, reference: #4196. The .png icons are a little bit blurry due to their small size when zoomed in, but their larger size is also problematic because it looks too big.

The only way to use SVG is to use react-native-svg, but it's using an Image, instead of a pin. In combination with the <Callout> it's a bit hectic solution and didn't actually display anything + we have event handlers, too, so it'd overcomplicate too much. New <View> would need to be introduced. Examples of such solutions:

• #4100
• https://stackoverflow.com/questions/51915353/react-native-maps-markers-image-doesnt-show-using-custom-marker-in-react-nativ

The .svg files converted using https://www.pngtosvg.com:

.png files in 512 x 512 dimensions:

[danieldanielecki]

Including icons as per https://github.com/oblador/react-native-vector-icons where some information is about it