Add cspell Config

This adds a `.cspell` config which is automatically used for both the VS Code extension (https://marketplace.visualstudio.com/items?itemName=streetsidesoftware.code-spell-checker) and the GitHub Action https://github.com/marketplace/actions/cspell-action

- The GitHub Action is added but is set to NOT be strict so it won't fail if there is a typo. (I thought it might be annoying if there are false positives). But typos will be displayed in the 'Files changed' view on GitHub Web Ui for Pull requests
- The VS Code extension is recommended to be used for users opening the project in VS Code.

Hopefully these changes will help prevent typos from entering the codebase.

FYI: You can also run `npx cspell \"**/*.*\" --no-progress` from root to perform a spellcheck.

.cspell.json

@@ -0,0 +1,230 @@
+{
+  "version": "0.2",
+  "words": [
+    "Aabb",
+    "ABAC",
+    "ACAC",
+    "afterjs",
+    "APAB",
+    "APAC",
+    "arcgis",
+    "Astro",
+    "babylonjs",
+    "bbox",
+    "bboxes",
+    "beforejs",
+    "Bounde",
+    "buble",
+    "carto",
+    "choropleth",
+    "CIELAB",
+    "CJKV",
+    "Clov",
+    "codecov",
+    "Cpath",
+    "Csvg",
+    "dbclick",
+    "dedos",
+    "deduped",
+    "Delle",
+    "desplazamiento",
+    "distjs",
+    "dlopen",
+    "documentationjs",
+    "easings",
+    "echartslayer",
+    "Epanechnikov",
+    "EPSG",
+    "falsey",
+    "flatgeobuf",
+    "flyto",
+    "GCEZ",
+    "Geobuf",
+    "getx",
+    "gety",
+    "glfx",
+    "GLJS",
+    "GLSL",
+    "GLTF",
+    "Gods’illa",
+    "gokun",
+    "gzipped",
+    "hacer",
+    "highp",
+    "Hoare",
+    "ifdefs",
+    "iframes",
+    "iife",
+    "imagecoord",
+    "incentivizing",
+    "inlinehilite",
+    "insee",
+    "instanceof",
+    "interp",
+    "jank",
+    "Jawg",
+    "jsons",
+    "kdbush",
+    "Klass",
+    "Kogod",
+    "komoot",
+    "lerp",
+    "libglew",
+    "libpango",
+    "librsvg",
+    "libxi",
+    "lowp",
+    "Luxemburg",
+    "mapa",
+    "maplibregl",
+    "mapme",
+    "mappedin",
+    "marcacci",
+    "MBGL",
+    "mbsv",
+    "mediump",
+    "Merc",
+    "merp",
+    "MIERUNE",
+    "mihalyi",
+    "mkdocs",
+    "mlcontour",
+    "mousein",
+    "mouseup",
+    "mozfullscreenchange",
+    "MSAA",
+    "msvs",
+    "Muhsinah",
+    "mult",
+    "Mycroft",
+    "Napoli",
+    "Nauticals",
+    "nbsp",
+    "nise",
+    "nofollow",
+    "nohup",
+    "noopener",
+    "Noto",
+    "nvmrc",
+    "Oberstein",
+    "Offc",
+    "onmozfullscreenchange",
+    "onmsfullscreenchange",
+    "onomy",
+    "onstyleimagemissing",
+    "onwarn",
+    "orta",
+    "OSMUS",
+    "OTLS",
+    "outofmaxbounds",
+    "OVERSCALETILEID",
+    "pango",
+    "perp",
+    "píng",
+    "Plantes",
+    "plantuml",
+    "plpopup",
+    "PLSS",
+    "pmtiles",
+    "pngjs",
+    "Postg",
+    "protobuf",
+    "pygments",
+    "pymdownx",
+    "qrcode",
+    "Rebranded",
+    "rfid",
+    "rgba",
+    "rtoggle",
+    "rtree",
+    "sdfgamma",
+    "slugg",
+    "splc",
+    "spys",
+    "SRPS",
+    "stringifiable",
+    "Struct",
+    "tada",
+    "tcpopup",
+    "testem",
+    "testid",
+    "threejs",
+    "tinysdf",
+    "tipopup",
+    "tlbr",
+    "trfilter",
+    "trheader",
+    "Trocadéro",
+    "trpopup",
+    "Truckeroo",
+    "tsdoc",
+    "tsnode",
+    "tstypes",
+    "Tulherias",
+    "ubyte",
+    "unassert",
+    "unblended",
+    "unbundle",
+    "unclustered",
+    "unflipped",
+    "unitbezier",
+    "unminified",
+    "Unpitched",
+    "unpremultiplied",
+    "unproject",
+    "unrotated",
+    "unscale",
+    "unserialize",
+    "unsets",
+    "unthrottled",
+    "untransitioned",
+    "unversioned",
+    "USGS",
+    "Utilice",
+    "vaos",
+    "verticalizable",
+    "verticalized",
+    "WCAG",
+    "webgl",
+    "webglcontextcreationerror",
+    "webglcontextlost",
+    "webglcontextrestored",
+    "webp",
+    "whoots",
+    "Wijk",
+    "wrsheader",
+    "wrslegend",
+    "wrslist",
+    "Xfrom",
+    "Xhalf",
+    "xlink",
+    "Xmax",
+    "Xmin",
+    "xvfb",
+    "Yhalf",
+    "Ymax",
+    "Ymin",
+    "Zanabazar",
+    "zelinsky",
+    "Zfrom",
+    "zoomto",
+    "ZULN"
+  ],
+  "allowCompoundWords": true,
+  "language": "en,en-GB,en-US,es-ES",
+  "ignorePaths": [
+    "**/*.geojson",
+    "**/*.glsl",
+    "**/*.gltf",
+    "**/*.json",
+    "**/*.pbf",
+    "**/*.svg",
+    "**/*.ts"
+  ],
+  "ignoreRegExpList": [
+    "@\\w+",
+    "\\[\\w+",
+    "// '\\w+'"
+  ],
+  "useGitignore": true
+}

.github/workflows/spellcheck.yml

@@ -0,0 +1,25 @@
+name: "Check spelling"
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  spellcheck:
+    permissions:
+      contents: read
+      pull-requests: read
+    runs-on: ubuntu-latest
+    if: ${{ github.actor != 'dependabot[bot]' }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: streetsidesoftware/cspell-action@v6
+        with:
+          check_dot_files: false
+          incremental_files_only: true
+          inline: warning
+          strict: false

.vscode/extensions.json

@@ -2,6 +2,7 @@
   "recommendations": [
     "dbaeumer.vscode-eslint",
     "EditorConfig.EditorConfig",
+    "streetsidesoftware.code-spell-checker",
     "stylelint.vscode-stylelint"
   ]
 }