OSM OpenMapTiles style (#1420)

* OpenMapTiles style

* Rename style snippets from layer_name.json to defaultstyle.json

* Add README to icons dir.

* Add README to icons dir.

* Rename snippets to style.json

* Fix spritezero - move icons to svg subdir

* Move icons from style/icons/svg directly to style/icons

Co-authored-by: Tomas Pohanka <TomPohys@gmail.com>

style/icons/bag.svg

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="14"
+   height="14"
+   viewBox="0 0 14 14"
+   id="svg2">
+  <metadata
+     id="metadata8">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs6" />
+  <rect
+     width="14"
+     height="14"
+     x="0"
+     y="0"
+     id="canvas"
+     style="fill:none;stroke:none;visibility:hidden" />
+  <path
+     d="M 6,1 C 5,1 4,2.0209735 4,3 l 0,1 -0.75,0 0,9 7.5,0 0,-9 L 10,4 10,3 C 10,2 8.9895132,1 8,1 z m 0.5,1.25 1,0 c 0.8599138,0 1.25,0.5994182 1.25,1.25 l 0,0.5 -3.5,0 0,-0.5 C 5.25,2.8707948 5.5557891,2.25 6.5,2.25 z M 2,4 C 0.64345039,4 0,4.6434504 0,6 l 0,5 c 0,1.35655 0.74831793,2 2,2 z m 10,0 0,9 c 1.251682,0 2,-0.748318 2,-2 L 14,6 C 14,4.6853974 13.377523,4 12,4 z"
+     id="luggage"
+     style="fill:#ac39ac;fill-opacity:1;stroke:none" />
+</svg>