This pull request introduces a new revert prop to the splitpanes component. When enabled, the component reverses the order of its panes (e.g., from [1, 2, 3] to [3, 2, 1]), providing developers with an easy way to alter the layout without needing to restructure the markup manually.

Background

Previous attempts to invert the pane order using only CSS proved insufficient because the pane resize calculations were not inverted accordingly. This discrepancy led to incorrect behavior during resize operations, as detailed in issues #216 and #148.

Key Changes

• Props : Add an optional prop revert, defaulting to false.
• Render Function: Modified the render function to check for the revert prop. When true, it reverses the order of the slot children.
• CSS Class: Added the splitpanes--reverse CSS class to indicate the reversed state, which can be used for additional styling if necessary.

These changes are opt-in and maintain backward compatibility. Please review the modifications and merge if they meet the project requirements.

Fix #216
Fix #148