Version 0.5.2 enhances stability of the 0.5 branch

A new version of RIOT was released to fix a few bugs found in the previous version.

All flavors of RIOT were updated, including the plugin version.

This is a highly recommended update.

Here is the list of changes:

* fixed r s h l v keys prohibited in batch->output path
* fixed filesize different single file vs batch mode if image is resized and using automatic mode.The original was analyzed instead of the resized one in batch mode.
* fixed RIOT stops opening images after switching to batch mode and back
* fixed scrollbar flicker
* fixed loading of TGA 8-bit files with a palette size greater that 256
* fixed TIFF parser didn't initialize the memory with zeros in stripped mode. This caused random bitmap data if the tiff file was corrupted/invalid.