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/beverages.svg

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<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"
+   id="svg2"
+   viewBox="0 0 14 14"
+   height="14"
+   width="14"
+   version="1.1">
+  <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
+     style="fill:none;stroke:none;visibility:hidden"
+     id="canvas"
+     y="0"
+     x="0"
+     height="14"
+     width="14" />
+  <path
+     id="beverages"
+     d="M 3,0 C 2,0 2,0.50227551 2,2 2,3 0,7 0,8 l 0,5 c 0,0.566252 0.467057,1 1,1 l 4,0 c 0.599561,0 1,-0.400439 1,-1 L 6,8 C 6,7 4,3 4,2 4,0.46896661 4,0 3,0 z m 7.875,1 -1,4 L 11,5 11.75,2 14,2 14,1 z M 7,6 8,13 c 0,0 0,1 1,1 l 2,0 c 1,0 1,-1 1,-1 l 1,-7 z"
+     style="fill:#ac39ac;fill-opacity:1;stroke:none" />
+</svg>