Migration of jsx files to tsx 2 (#850)

This is to continue the work of migrating all the jsx files into tsx
files.
The MO is basically described here: #848.

About 7 files to go...

src/components/_DeleteStopButton.tsx

@@ -0,0 +1,22 @@
+import React from 'react'
+
+import InputButton from './InputButton'
+import {MdDelete} from 'react-icons/md'
+
+
+type DeleteStopButtonProps = {
+  onClick?(...args: unknown[]): unknown
+};
+
+
+export default class DeleteStopButton extends React.Component<DeleteStopButtonProps> {
+  render() {
+    return <InputButton
+      className="maputnik-delete-stop"
+      onClick={this.props.onClick}
+      title={"Remove zoom level from stop"}
+    >
+      <MdDelete />
+    </InputButton>
+  }
+}