Project tree view and creation (#203)

* Implement creating and importing new projects

* Add downloading a zip of a project

* Project validation (WIP)

* Add project side panel, remove project pages

* Project file saving

* Add file tree actions to rename and delete

* Fix file creation auto focus

* Add button to save file from menu

* Add project creation

* Fix specificity on version switcher button

* Update default version to 1.19

* List project files by type, remember project and delete project

src/app/components/BtnMenu.tsx

@@ -16,7 +16,7 @@ export function BtnMenu(props: BtnMenuProps) {
 	const [active, setActive] = useFocus()
 
 	return <div {...props} class={`btn-menu${relative === false ? ' no-relative' : ''} ${props.class}`}>
-		<Btn {...{icon, label, tooltip, tooltipLoc}} onClick={setActive} />
+		<Btn {...{icon, label, tooltip, tooltipLoc}} onClick={() => setActive()} />
 		{active && <div class="btn-group">
 			{children}
 		</div>}