All: Refactor Markdown rendering (#1315)

* Refactoring MdToHtml to avoid manually rendering tokens

* Minor fix

* Fixed loading of resources

* Handle clicking on checkboxes

* Added back Katex support

* Fixed issues with Katex and note rendering

* Added back support for links

* Restored code block highlighting support

* clean up

* Applying update to mobile

* Fixed handling of links and cleaned up to share more code between mobile and desktop

* Restored content caching and improved handling of additional assets

* Clean up and a few fixes

* Applied more updates to mobile and added code highlighting support

ReactNativeClient/lib/services/ModelCache.js

@@ -0,0 +1,38 @@
+const BaseItem = require('lib/models/BaseItem');
+
+class ModelCache {
+
+	constructor() {
+		this.cache_ = {};
+	}
+
+	async byIds(itemType, ids) {
+		const ModelClass = BaseItem.getClassByItemType(itemType);
+		const output = [];
+
+		const remainingIds = [];
+		for (let i = 0; i < ids.length; i++) {
+			const id = ids[i];
+			if (!this.cache_[id]) {
+				remainingIds.push(id);
+			} else {
+				output.push(this.cache_[id].model);
+			}
+		}
+
+		const models = await ModelClass.byIds(remainingIds);
+		for (let i = 0; i < models.length; i++) {
+			this.cache_[models[i].id] = {
+				model: models[i],
+				timestamp: Date.now(),
+			}
+
+			output.push(models[i]);
+		}
+
+		return output;
+	}
+
+}
+
+module.exports = ModelCache;