v3.3 - Update Readme, fix cleanup bug, flip button CSS.

-v3.3.
-Update README.md.
  -Remove mention of Docker repo, as it is not maintained.
  -I appreciate all of the community feedback at #46.
  -I will come up with an official Docker solution.
-Fix bug in cleanFiles() function that was causing problems with archive conversions & preventing cleanup.
-Flip button CSS, so buttons don't appear quite so... upside-down... all the time.
-Remove un-needed (redundant) button related CSS from HRConvert2.css.
-Increase default DeleteThreshold in config.php from 30 to 60 minutes.
-Remove un-needed extension being passed to the convertDrawings() function.
-Fix drawings not returning a valid filename.
  -Conversions would complete, but not download.
-Tested ImageMagick support for SVG, could not get it to work.
-Tested Dia support for converting things into PNG, BMP, and JPG. Got PNG to work, so added support.

convertCore.php

@@ -417,7 +417,7 @@ function verifyGlobals() {
   // / Set global variables to be used through the entire application.
   global $URL, $URLEcho, $HRConvertVersion, $Date, $Time, $SesHash, $SesHash2, $SesHash3, $SesHash4, $CoreLoaded, $ConvertDir, $InstLoc, $ConvertTemp, $ConvertTempDir, $ConvertGuiCounter1, $DefaultApps, $RequiredDirs, $RequiredIndexes, $DangerousFiles, $Allowed, $ArchiveArray, $DearchiveArray, $DocumentArray, $SpreadsheetArray, $PresentationArray, $ImageArray, $MediaArray, $VideoArray, $StreamArray, $DrawingArray, $ModelArray, $SubtitleArray, $PDFWorkArr, $ConvertLoc, $DirSep, $SupportedConversionTypes, $Lol, $Lolol, $Append, $PathExt, $ConsolidatedLogFileName, $ConsolidatedLogFile, $Alert, $Alert1, $Alert2, $Alert3, $FCPlural, $FCPlural1, $FCPlural2, $FCPlural3, $UserClamLogFile, $UserClamLogFileName, $UserScanCoreLogFile, $UserScanCoreFileName, $SpinnerStyle, $SpinnerColor, $FullURL, $ServerRootDir, $StopCounter, $SleepTimer, $PermissionLevels, $ApacheUser, $File, $HeaderDisplayed, $UIDisplayed, $FooterDisplayed, $LanguageStringsLoaded, $GUIDisplayed, $Version, $FaviconPath, $DropzonePath, $DropzoneStylesheetPath, $StylesheetPath, $JsLibraryPath, $JqueryPath, $GUIDirection, $SupportedFormatCount, $GUIAlignment, $GreenButtonCode, $BlueButtonCode, $RedButtonCode, $DefaultButtonCode;
   // / Application related variables.
-  $HRConvertVersion = 'v3.2.9';
+  $HRConvertVersion = 'v3.3';
   $GlobalsAreVerified = FALSE;
   $CoreLoaded = TRUE;
   $StopCounter = $SleepTimer = 0;
@@ -2177,4 +2177,4 @@ function userVirusScan($FilesToScan, $type) {
     if ($ScanErrors) logEntry('User Virus Scan finished with errors.');
     if ($Verbose)  logEntry('User Virus Scan Complete.'); } }
 // / -----------------------------------------------------------------------------------
-?>
+?>