Closes #1811

Work around a Chrome regression where it aborts the drag if the
setDragImage image is src-less.

Closes #1810

Issue #1787

Issue #1787

Closes #1807
Closes #1808

Original error & warning icons had jagged edges due to being GIFs
This made them look quite poor/low quality on dark BG'd themes
So, new, better looking icons added which have been run thru TinyPNG for
compression
Result is fewer bytes than original and they look good on dark BG's too

Issue #1801

Closes #1795

I have created this simple css autocomplete/hint that uses data from
the css mode. Autocomplete works for both properties and values - but
it does not filter the values by property. Better than nothing for
now.

Closes #1802

Issue #1793

Issue #1799

Issue #1791

Issue #1060

Issue #1743

Issue #1786

Demo was incorrectly named as showing 'Highlighter', fixed to 'Selection'

Signed-off-by: Chris Granger <ibdknox@gmail.com>

Issue #1782

Closes #1784

Issue #1781

Closes #1779