Syntax highlighting for Svelte

[damascene]

Could you please add support for Svelte syntax highlighting. I tried to use HTML markup syntax with Geany that depends on your library but it seems to break on some tags like {# each} and {#if}. Probably because of {#.

I've included screenshot and code snippet that may help represent the current situation.

Docs: https://svelte.dev/docs/introduction

<script>
	let count = 0;

	function increment() {
		count += 1;
	}
</script>

<button on:click={increment}>
	Clicked {count}
	{count === 1 ? 'time' : 'times'}
</button>

{#if count > 10}
	<p>{count} is greater than 10</p>
{:else if count < 5}
	<p>{count} is less than 5</p>
{:else}
	<p>{count} is between 5 and 10</p>
{/if}

Originally reported in geany/geany#3562

[nyamatongwe]

Could you please add support for Svelte syntax highlighting.

Commonly, new features arrive from people interested in that feature. Current contributors are unlikely to take on new features that they won't use themselves.

Since this would be an extension to HTML, like the current support for Mako and Django, it would be a change to lexilla/lexers/LexHTML.cxx. Understanding code that mentions 'mako' and 'django' would be a starting point.