Fixes:

* Fixed process termination code for when cancel button pressed
* Fixed logging code for when cancel button pressed
* Fixed typo in the file description

Changes:

* Added Settings, Tools and Help menus
* Moved all user accessible settings to Settings menu
* Added a tool to manipulate extensions and codecs in custom.ini
* Added a tool to retrieve codecs from matroska files
* Added ability to pass file names to MKVcleaver from command line, Open With or Send To menus
* Added Help and Donate links to Help menu
* MKVcleaver will update MediaInfo.dll to the latest version
* Added support for webm files
* Added V_VP8 codec