Improve rendering of XDXF

[soshial]

Completed:

• use CSS for all XDXF element (decrease size of output dict file)
• created a list (ol / ul) for nested <def>s
• support loading of <abbreviations> data
• show js tooltips for abbreviations
• fixed showing hidden <gr>
• fixed losing spaces before XDXF tags
• add braces to <co>
• show CSS instead of inlined HTML tags for: <ex>, <pos>, <abbr>, <k>, <gr>, <mrkd>

Screenshot: