* Software update: Rework preparing the flash process

- Finish all unnecessary threads and processes before the flash process
- Use flash.start to stop other (user-defined) processes

src/gui/update_ext.h

@@ -46,8 +46,6 @@ class CExtUpdate
 		std::string imgFilename;
 		std::string mtdRamError;
 		int mtdNumber;
-		int MTDBufSize;
-		char *MTDBuf;
 		int fd1, fd2;
 		FILE *f1;
 		std::string mtdramDriver;