Issue #2681

Ctrl-arrow key presses were, for some reason, inserting such characters
into our textarea.

Issue #2689

Bind Cmd-Left to goLineLeft and Cmd-right to goLineRight instead of goLineStart and goLineEnd
Create and bind delVisualLeft and delVisualRight to Cmd-Backspace and Cmd-Delete

Closes #2687

You might actually want to align things on long lines

Issue #2688

Issue #2688

Error occurs when entering multiple dots

Both a potential infinite loop, due to updateDisplayIfNeeded not using
the updated set of visibile lines, and the fact that the current check
wasn't really covering changing document size, due to it happening before
the call to setDocumentHeight

Issue #2683

Issue #2671

Issue #2665

It doesn't need it

Now nested operations from different editors end at the same time

Issue #2678

Looks at token types to determine whether the quote would actually open a string

Issue #2657

Issue #2663

To make it less likely that an error will corrupt its value and
break all further signalLater events.

Issue #2626

Issue #2659

Also updated select block to return selectionStart.
Operators from now on will stop using curStart and curEnd, and rely on the current selection instead. The selection will be generated in evalInput if needed.