Lots of changes (#70)

Image extraction and conversion to formats 

Multi parallel file execution for all forms so you can input multiple files quickly 

Any file at all pdf using libreoffice, super powerful
Sadly makes docker image larger but worth it 

OCR PDF using ocr my pdf
Works awesomely for adding text to a image

Improved compression using ocr my pdf app

Settings page with custom download options such as 
- open in same window
- open in new window
- download
- download as zip

Update detection in settings page it should show notification if there is a update (very hidden)

UI cleanups

Add other image formats to PDF to Image

Various fies to icons, and pdf.js usage

src/main/java/stirling/software/SPDF/controller/converters/ConvertOfficeController.java

@@ -0,0 +1,82 @@
+package stirling.software.SPDF.controller.converters;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.servlet.ModelAndView;
+
+import stirling.software.SPDF.LibreOfficeListener;
+import stirling.software.SPDF.utils.PdfUtils;
+import stirling.software.SPDF.utils.ProcessExecutor;
+@Controller
+public class ConvertOfficeController {
+
+	
+	@GetMapping("/file-to-pdf")
+    public String convertToPdfForm(Model model) {
+        model.addAttribute("currentPage", "file-to-pdf");
+        return "convert/file-to-pdf";
+    }
+
+	@PostMapping("/file-to-pdf")
+	public ResponseEntity<byte[]> processPdfWithOCR(@RequestParam("fileInput") MultipartFile inputFile) throws IOException, InterruptedException {
+		
+		//unused but can start server instance if startup time is to long
+		//LibreOfficeListener.getInstance().start();
+		
+		byte[] pdfByteArray = convertToPdf(inputFile);
+		return PdfUtils.bytesToWebResponse(pdfByteArray, inputFile.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_convertedToPDF.pdf");
+	}
+	
+	
+public byte[] convertToPdf(MultipartFile inputFile) throws IOException, InterruptedException {
+    // Save the uploaded file to a temporary location
+    Path tempInputFile = Files.createTempFile("input_", "." + getFileExtension(inputFile.getOriginalFilename()));
+    inputFile.transferTo(tempInputFile.toFile());
+
+    // Prepare the output file path
+    Path tempOutputFile = Files.createTempFile("output_", ".pdf");
+
+ // Run the LibreOffice command
+    List<String> command = new ArrayList<>(Arrays.asList("unoconv", "-vvv",
+            "-f",
+            "pdf",
+            "-o",
+            tempOutputFile.toString(),
+            tempInputFile.toString()));
+    int returnCode = ProcessExecutor.runCommandWithOutputHandling(command);
+
+    // Read the converted PDF file
+    byte[] pdfBytes = Files.readAllBytes(tempOutputFile);
+
+    // Clean up the temporary files
+    Files.delete(tempInputFile);
+    Files.delete(tempOutputFile);
+
+    return pdfBytes;
+}
+
+
+
+private String getFileExtension(String fileName) {
+    int dotIndex = fileName.lastIndexOf('.');
+    if (dotIndex == -1) {
+        return "";
+    }
+    return fileName.substring(dotIndex + 1);
+}
+}