Bump version number to 1.3.1.2

Added Swedish translation (thanks @zeular)

Updated version to 1.3.1

Added C:\Windows\Media as default folder for warning sound selection

removed unneeded icons, replaced black .exe logo and "unknown" icon w…

…ith new, higher res versions. Added check that automatically removes the toast when battery level returns to a good level.

Updated URL to update check XML file

Updated version number in binary.

Updated readme. Low battery warning now vanishes again when level ret…

…uns to normal.

Changed icon for "no controller detected" from "disconnected" to "unk…

…nown".

Added note about my code changes