[flash] remove flash extension, browsers don't support it any more

ext/handle_flash/info.php

@@ -1,16 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Shimmie2;
-
-class FlashFileHandlerInfo extends ExtensionInfo
-{
-    public const KEY = "handle_flash";
-
-    public string $key = self::KEY;
-    public string $name = "Handle Flash";
-    public string $url = self::SHIMMIE_URL;
-    public array $authors = self::SHISH_AUTHOR;
-    public string $description = "Handle Flash files.";
-}

ext/handle_flash/main.php

@@ -1,39 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Shimmie2;
-
-class FlashFileHandler extends DataHandlerExtension
-{
-    protected array $SUPPORTED_MIME = [MimeType::FLASH];
-
-    protected function media_check_properties(MediaCheckPropertiesEvent $event): void
-    {
-        $event->image->lossless = true;
-        $event->image->video = true;
-        $event->image->image = false;
-
-        $info = getimagesize($event->image->get_image_filename());
-        if ($info) {
-            $event->image->width = $info[0];
-            $event->image->height = $info[1];
-        }
-    }
-
-    protected function create_thumb(string $hash, string $mime): bool
-    {
-        if (!Media::create_thumbnail_ffmpeg($hash)) {
-            copy("ext/handle_flash/thumb.jpg", warehouse_path(Image::THUMBNAIL_DIR, $hash));
-        }
-        return true;
-    }
-
-    protected function check_contents(string $tmpname): bool
-    {
-        $fp = fopen($tmpname, "r");
-        $head = fread($fp, 3);
-        fclose($fp);
-        return in_array($head, ["CWS", "FWS"]);
-    }
-}

ext/handle_flash/theme.php

@@ -1,31 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Shimmie2;
-
-class FlashFileHandlerTheme extends Themelet
-{
-    public function display_image(Page $page, Image $image)
-    {
-        $ilink = $image->get_image_link();
-        // FIXME: object and embed have "height" and "width"
-        $html = "
-			<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'
-			        codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0'
-					height='{$image->height}'
-					width='{$image->width}'
-					wmode='opaque'
-					>
-				<param name='movie' value='$ilink'/>
-				<param name='quality' value='high' />
-				<embed src='$ilink' quality='high'
-					pluginspage='http://www.macromedia.com/go/getflashplayer'
-					height='{$image->height}'
-					width='{$image->width}'
-					wmode='opaque'
-					type='application/x-shockwave-flash' />
-			</object>";
-        $page->add_block(new Block("Flash Animation", $html, "main", 10));
-    }
-}