feat(timeline): Implement new options 'horizontalScrollKey' (#1670, #1323) and 'horizontalScrollInvert' (#1595)

[LukasWillin]

Commit

feat: Implement new options 'horizontalScrollKey' (#1670, #1323) and 'horizontalScrollInvert' (#1595) to allow for both vertical and horizontal scrolling & invert the horizontal scroll direction.

Feature Changes

modified:   docs/timeline/index.html                        | Add documentation for options 'horizontalScrollKey' and 'horizontalScrollInvert'.
modified:   examples/timeline/other/horizontalScroll.html   | Add new options 'horizontalScrollKey' and 'horizontalScrollInvert' to horizontal scroll example.
modified:   lib/timeline/Core.js                            | Implement new options to allow for both vertical and horizontal scrolling & invert the horizontal scroll direction.
modified:   lib/timeline/optionsTimeline.js                 | Add options 'horizontalScrollKey' and 'horizontalScrollInvert'.
modified:   types/index.d.ts                                | Add type definitions for options 'horizontalScrollKey' and 'horizontalScrollInvert'.

Lint Changes

• Fix eslint errors such as missing doc comments or faulty syntax where necessary.
• Fix eslint error no-prototype-builtins
• Fix eslint-disable-line comments being on the wrong line to suppress the stated rule.

Example

See the horizontalScroll example: examples/timeline/other/horizontalScroll.html

var options = {
  horizontalScroll: true,
  horizontalScrollKey: 'shiftKey', /* If you want to enable both vertical and horizontal scrolling, uncomment this and  the line below. */
  verticalScroll: true, /* Uncomment this line with the line above to allow for both scroll-axis. */
  horizontalScrollInvert: true, /* Invert the horizontal scroll direction by uncommenting this line. */
  zoomKey: 'ctrlKey',
};