Dexpot 1.5.8

# Features
* Plugin API extensions
* Hungarian translation update

# Bugs
* Fixed diagonal desktop icon bug
* Fixed Taskbar Pager crash when changing the desktop count
* Fixed appearance of Taskbar Pager on Aero Basic
* Contextual menus in the Taskbar Pager didn't work when running Dexpot as admin
* Fixed wallpaper flashing when switching with Dexcube
* "Hide desktop icons" tool stopped working after a wallpaper change on Vista/7
* Desktop switching using the forward/backward mouse buttons didn't work when running Dexpot as admin
* Esc correctly cancels DexTab
* Fixed positioning of fullscreen preview live windows with certain desktop counts
* Improved compatibility with KeePass
* Desktop Manager no longer restores position on double-click when "Lock position" is enabled