Closes #1826

Issue #1836

Issue #1787

Closes #1833
Closes #1834

Closes #1830

Issue #1824

Issue #1825

Closes #1803

There must be an error in line 73 because if the phrase starts at the
same character position then conditional if will always become true
(same number is equal to same number) therefore it must be changed to
strict less than.

Closes #1820

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