style: reformat C/C++ sources and headers with clang-format

Run clang-format over all project C/C++ source and header files
(.c, .cpp, .cc, .h, .hpp, .hh, .m, .mm) under app/ and tests/.
Non-source files (svg, qm, qrc, etc.) were not touched.

tests/gtest/ffmpeg_decoder_hw_test.cpp

@@ -12,7 +12,8 @@ using namespace olive;
 
 TEST(FFmpegDecoderHW, H264_422_10bit_CPUFrame_IsNotBlack)
 {
-	const QString path = QStringLiteral("/home/mikesolar/Videos/dual_system_video.MOV");
+	const QString path =
+		QStringLiteral("/home/mikesolar/Videos/dual_system_video.MOV");
 
 	if (!QFileInfo::exists(path)) {
 		GTEST_SKIP() << "Test footage not available: " << path.toStdString();