Add MarkdownRenderer.getLinkAtPosition() for clickable links on ScriptPanels

[weavermedia]

Markdown text drawn on a ScriptPanel via Content.createMarkdownRenderer() and Graphics.drawMarkdownText() renders hyperlinks as underlined text, but there is no way for the script to detect clicks on them, so links are purely decorative.

This adds one scripting API method to the MarkdownRenderer object:

Panel1.setMouseCallback(function(event)
{
	var link = md.getLinkAtPosition([event.x, event.y]);

	if (event.clicked && link.length > 0)
		Engine.openWebsite(link);
	else
		this.setMouseCursor(link.length > 0 ? "PointingHandCursor" : "NormalCursor", Colours.white, [0, 0]);
});

It returns the URL of the hyperlink at the given panel-relative [x, y] position, or an empty string. The script decides what to do with the link, and the same call drives a hand cursor on hover.

Implementation notes:

• The hit-test reuses the hyperlink rectangles the parser already stores: the body of MarkdownParser::getHyperLinkForEvent is extracted unchanged into a new point-based getHyperLinkForPoint, with the event version delegating to it, so all existing callers (doc browser etc.) behave identically.
• The new method translates the panel-local position into document space using the area set by setTextBounds() and takes the same lock as the other MarkdownRenderer scripting methods.
• Returns an empty string if setTextBounds() has not been called yet; a malformed position argument reports a script error via the existing ApiHelpers::getPointFromVar validation.

Tested in the IDE: clicking a rendered link opens the browser, clicks on plain text and empty space do nothing, hover cursor works, and internal and external links in the in-app documentation browser still work through the delegating code path.

Requested on the forum: https://forum.hise.audio/topic/14023/how-to-do-text-links-in-a-settings-panel

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