Initial migration to typescript (#845)

This migrates some utilities classes from javascript to typescript.
Nothing special about the migration, mainly added types and made sure
the code adheres to the strict mode.

I have picked some small files so git doesn't think they are the same
since they are "very different".
I hope that in later PRs, when migrating lager files this won't be an
issues.

src/components/Collapse.jsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import { Collapse as ReactCollapse } from 'react-collapse'
-import accessibility from '../../libs/accessibility'
+import {reducedMotionEnabled} from '../../libs/accessibility'
 
 
 export default class Collapse extends React.Component {
@@ -15,7 +15,7 @@ export default class Collapse extends React.Component {
   }
 
   render() {
-    if (accessibility.reducedMotionEnabled()) {
+    if (reducedMotionEnabled()) {
       return (
         <div style={{display: this.props.isActive ? "block" : "none"}}>
           {this.props.children}

src/components/FilterEditor.jsx

@@ -1,6 +1,6 @@
 import React from 'react'
 import PropTypes from 'prop-types'
-import { combiningFilterOps } from '../libs/filterops.js'
+import {combiningFilterOps} from '../libs/filterops'
 import {mdiTableRowPlusAfter} from '@mdi/js';
 import {isEqual} from 'lodash';
 

src/components/SingleFilterEditor.jsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-import { otherFilterOps } from '../libs/filterops.js'
+import {otherFilterOps} from '../libs/filterops'
 import InputString from './InputString'
 import InputAutocomplete from './InputAutocomplete'
 import InputSelect from './InputSelect'