Memotron - Your memory atlas

# v0.62.0 - iOS share & more - iOS share is now available on iOS devices. Click share from any app on iOS devices and choose Memotron to share the content. - Markdown now supports inserting emojis using `:` shortcut. Just type `:` and select the emoji from the autocomplete list. - Markdown nodes now support the ability to set a cover photo. Click the context menu on a markdown node and choose "Set cover photo" to set a cover photo. - This update adds support to use external drawing site pages as embeds in markdown. - PDF improvements - Added the ability to cache recently used PDFs to avoid re-downloading the same PDF multiple times. - Added the ability to preserve PDF zoom level and page number when re-opening a PDF node. - Improved PDF bookmarks panel. - Search bar in PDF node page is minimized by default to avoid cluttering the page. - Other bug fixes and improvements - Bookmark improvements - Added the ability to copy text based bookmarks like web text bookmarks, social media clips and kindle highlights. - Added the ability to search bookmarks in bookmarks panel. - Other small improvements and bug fixes