[BC] Upgraded dependencies, dropped support for anything below PHP 8.0. (#849)

* GitHub actions + style fixes + updated packages

* Fixed workflows dir

* Support for PHP 8.1 (#1)

* Update README.md

* Revert some changes from upstream

tests/FFMpeg/Unit/Media/WaveformTest.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Media;
+
+use FFMpeg\Media\Waveform;
+
+class WaveformTest extends AbstractMediaTestCase
+{
+    public function testFiltersReturnFilters()
+    {
+        $driver = $this->getFFMpegDriverMock();
+        $ffprobe = $this->getFFProbeMock();
+
+        $waveform = new Waveform($this->getAudioMock(__FILE__), $driver, $ffprobe, 640, 120);
+        $this->assertInstanceOf('FFMpeg\Filters\Waveform\WaveformFilters', $waveform->filters());
+    }
+
+    public function testAddFiltersAddsAFilter()
+    {
+        $driver = $this->getFFMpegDriverMock();
+        $ffprobe = $this->getFFProbeMock();
+
+        $filters = $this->getMockBuilder('FFMpeg\Filters\FiltersCollection')
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $filter = $this->getMockBuilder('FFMpeg\Filters\Waveform\WaveformFilterInterface')->getMock();
+
+        $filters->expects($this->once())
+            ->method('add')
+            ->with($filter);
+
+        $waveform = new Waveform($this->getAudioMock(__FILE__), $driver, $ffprobe, 640, 120);
+        $waveform->setFiltersCollection($filters);
+        $waveform->addFilter($filter);
+    }
+
+    /**
+     * @dataProvider provideSaveOptions
+     */
+    public function testSave($commands)
+    {
+        $driver = $this->getFFMpegDriverMock();
+        $ffprobe = $this->getFFProbeMock();
+
+        $pathfile = '/tests/files/Audio.mp3';
+
+        array_push($commands, $pathfile);
+
+        $driver->expects($this->once())
+            ->method('command')
+            ->with($commands);
+
+        $waveform = new Waveform($this->getAudioMock(__FILE__), $driver, $ffprobe, 640, 120, array('#FFFFFF'));
+        $this->assertSame($waveform, $waveform->save($pathfile));
+    }
+
+    public function provideSaveOptions()
+    {
+        return [
+            [
+                [
+                    '-y', '-i', null, '-filter_complex',
+                    'showwavespic=colors=#FFFFFF:s=640x120',
+                    '-frames:v', '1',
+                ],
+            ],
+        ];
+    }
+}