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/archaeological_site.svg

@@ -0,0 +1,3 @@
+<svg width="14" height="14" viewBox="0 0 14 14" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3 0V1H4C4.59887 1 4.84114 2.04307 4.9375 2.90625C3.96523 2.1499 3.02499 1.87959 2.21875 2.03125C1.18844 2.22506 0.5 3.1743 0.5 4.25C0.5 5.09192 0.812116 5.82886 1.34375 6.59375C1.80837 7.26223 2.46359 8.03381 3.28125 8.96875C3.6477 10.3278 4.3223 11.5723 5 12.25V13L4 13.5V14H10V13.5L9 13V12.25C9.6777 11.5723 10.3523 10.3278 10.7188 8.96875C11.5364 8.03381 12.1916 7.26223 12.6562 6.59375C13.1879 5.82886 13.5 5.09192 13.5 4.25C13.5 3.1743 12.8116 2.22506 11.7812 2.03125C10.975 1.87959 10.0348 2.1499 9.0625 2.90625C9.15886 2.04307 9.40113 1 10 1H11V0H3ZM2.375 3.03125C2.88484 2.93535 3.7354 3.1325 4.71875 4.03125C3.60374 4.16963 3 5.14956 3 7C3 7.0312 2.99952 7.06244 3 7.09375C2.65948 6.6981 2.37619 6.34769 2.15625 6.03125C1.68788 5.35738 1.5 4.86277 1.5 4.25C1.5 3.54968 1.81093 3.13736 2.375 3.03125ZM11.125 3.03125C11.3131 3.00414 11.484 3.00472 11.625 3.03125C12.1891 3.13736 12.5 3.54968 12.5 4.25C12.5 4.86277 12.3121 5.35738 11.8438 6.03125C11.6238 6.34769 11.3405 6.6981 11 7.09375C11.0005 7.06244 11 7.0312 11 7C11 5.14956 10.3963 4.16963 9.28125 4.03125C9.99261 3.38109 10.633 3.10216 11.125 3.03125Z" fill="#734A08"/>
+</svg>