Merge Webbedspace enhancement as of 25-sep

[greyelf]

Merge from Webbedspace's repository as of 25-sep:

o Improved performance of Tweelexer
o Minor Tweelexer bug fixes
o Selected passage colouring improvements
o Syntax highlighting for macro params
o Made the passage tooltips functional
o Fixed file format backwards-compatibility
o Added file drag and drop functionality
o Added image drag-and-drop and embedding
o Added Copy and Paste menu items to image previews
o Images are now thumbnailed in the story map

[greyelf]

o Created branch "i003_webbedspace_changes" and merged in listed enhancements.
o Fixed "TypeError: Required argument 'w' (pos 5) not found" error that occurs when an image added via Drag-n-Drop is display as an icon. Changed call to the DrawBitmap method to also pass image Width and Height.