develop (#43)

* fix(ts): use strict mode strictNullChecks etc

* chore: Use extended React.HTMLAttributes<> (#41)

* refactor(code-format): add prettier closes #42

* feat(renderer): add snap to grid option closes #20

* chore(dependabot): use develop as target branch

src/plugins/Controls/index.tsx

@@ -2,7 +2,7 @@ import React, { CSSProperties } from 'react';
 import classnames from 'classnames';
 
 import { fitView, zoomIn, zoomOut } from '../../utils/graph';
-import PlusIcon from '../../../assets/icons/plus.svg';
+import PlusIcon from '../../../assets/icons/plus.svg';
 import MinusIcon from '../../../assets/icons/minus.svg';
 import FitviewIcon from '../../../assets/icons/fitview.svg';
 
@@ -13,10 +13,7 @@ const baseStyle: CSSProperties = {
   left: 10,
 };
 
-interface ControlProps {
-  style?: CSSProperties;
-  className?: string
-};
+interface ControlProps extends React.HTMLAttributes<HTMLDivElement> {}
 
 export default ({ style, className }: ControlProps) => {
   const mapClasses: string = classnames('react-flow__controls', className);
@@ -26,7 +23,7 @@ export default ({ style, className }: ControlProps) => {
       className={mapClasses}
       style={{
         ...baseStyle,
-        ...style
+        ...style,
       }}
     >
       <div