remove get() with string from Svelte calls

[nolanlawson]

This has some odd failures that I'm currently working around (with get() || {}), but it's something we need to do because get('foo') is getting deprecated: sveltejs/svelte#1347

[nolanlawson]

I don't know why get() sometimes returns null/undefined, but it seems to happen within scheduleIdleTask() which means it's happening outside of the component lifecycle, so that's probably it. I don't want to wrap every get() call ever though.

[nolanlawson]

minimal svelte template to demonstrate what's causing the null bugs:

<h1>Hello {{name}}!</h1>

<script>
	export default {
		oncreate() {
			setTimeout(() => this.destroy(), 1000)
			setTimeout(() => {
				let { name } = this.get()
				console.log('name', name)
			}, 2000)
		}
	}
</script>

[nolanlawson]

bug filed on svelte: sveltejs/svelte#1354