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/amusement_arcade.svg

@@ -0,0 +1,14 @@
+<svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g clip-path="url(#clip0)">
+<path d="M3.99984 0.982666H0V2.98268H3.99984V0.982666Z" fill="#2F6133"/>
+<path d="M13.9996 0.982666H9.99976V2.98268H13.9996V0.982666Z" fill="#2F6133"/>
+<path d="M9.99999 2.98584H8V4.98585H9.99999V2.98584Z" fill="#2F6133"/>
+<path d="M5.99987 2.98584H3.99988V4.98585H5.99987V2.98584Z" fill="#2F6133"/>
+<path d="M1.99999 4.98901V6.98903H0V13.9891H1.99999V11.9891H3.99999V13.9891H5.99998V11.9891H7.99998V13.9891H9.99997V11.9891H12V13.9891H14V6.98903H12V4.98901H1.99999ZM3.99999 6.98903H5.99998V8.98904H3.99999V6.98903ZM7.99983 6.98903H9.99982V8.98904H7.99983V6.98903Z" fill="#2F6133"/>
+</g>
+<defs>
+<clipPath id="clip0">
+<rect width="14" height="14" fill="white"/>
+</clipPath>
+</defs>
+</svg>