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/military_red_hatch.svg

@@ -0,0 +1,3 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path opacity="0.12" d="M0 2.625V3.375L3.375 0H2.625L0 2.625ZM0 8.625V9.375L9.375 0H8.625L0 8.625ZM0 14.625V15.375L15.375 0H14.625L0 14.625ZM0 20.625V21.375L21.375 0H20.625L0 20.625ZM2.625 24H3.375L24 3.375V2.625L2.625 24ZM8.625 24H9.375L24 9.375V8.625L8.625 24ZM14.625 24H15.375L24 15.375V14.625L14.625 24ZM20.625 24H21.375L24 21.375V20.625L20.625 24Z" fill="#FF5555"/>
+</svg>