Major update of 1.0-BETA

+ Added function to read LAST_CHANGE file and return its value

+ Added function to execute WIN_INSTALLER

+ Added function in JFMain to execute winDownload. In the future it'll be modified to execute for Linux and Mac too

+ Added more CONSTANTS, needed for aux vars

# Fixed cancel in DownloadTask. It didn't execute correctly to cancel the download

# Fixed JFMain to show all the LAST_CHANGE string

# Fixed other minor exception

- Deleted some debug messages