Bug fixes

• Fix grabbed hotkeys being incorrectly received by other applications. Revert commit eb46b84, which should fix #181
• Fixed crashes when processing <code> literals in strings. Partial fix for #110, fixing the most common cases.
  It is now possible to place <code> and <code/> literals in Phrases.
  Additionally, such literals can be typed in scripts using the keyboard.send_keys function.
• Increased the reliability of the window filter detection dialog in autokey-qt. The dialog allows sampling windows to aid writing window filters. Due to timing issues in certain cases, sometimes the window title of the previously active window was returned.