Create v1.2.0.md, draft of release announcements

website/release_announcement_drafts/v1.2.0.md

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+We're excited to announce the v1.2.0 release of JBrowse Web!
+
+## New plugin store added to website
+
+One of the core aspects of JBrowse 2 is that it is an extensible
+platform for biological visualization that can be extended with
+plugins. We are excited to introduce the first version of our
+plugin store, where we list the current external plugins that
+are available. Check it out [here](https://jbrowse.org/jb2/plugin_store).
+In the coming weeks, we will also be bringing this plugin store directly
+into the application, allowing plugin installation with the click of a button.
+Stay tuned!
+
+## Native SVG export
+
+We're excited to introduce a new feature to JBrowse Web: built-in
+SVG export of track visualizations!
+
+![](./img/svg_screenshot.png)
+
+With the addition of this feature, it is now even easier to create
+publication-ready screenshots of JBrowse views.
+
+## Virtualized track lists
+
+An important consideration for genomics software is scaling to very large
+datasets. We have implemented a virtualization of our hierarchical track
+selector, enabling it to support arbitrarily large track lists.
+
+## Lazy loading
+
+We have expanded our use of [lazy loading](https://reactjs.org/docs/code-splitting.html#reactlazy), which optimizes app performance and
+improves load times.