A "cursor" mode has been added to the main view that can
be toggled by pressing CTRL-X. While in cursor mode, any
operations that would normally work on the "top" line will
now operate on the focused line instead.
Added CTRL-D and CTRL-U hotkeys to move down/up by half
a page.

Added an auto-width flag to the elements of the
line-format array that indicates that the width of the
field should automatically be determined by the observed
values.

Added bunyan log format from Tobias Gruetzmacher.

Added cloudlare log format from @minusf.

Number fields used in a JSON log format line-format
array now default to being right-aligned. Also, added
prefix and suffix to line-format elements so a
string can optionally be prepended/appended if the value
is not empty.

JSON log format detection has been improved to not rely
on matching the file name. All possible formats are
tried and the one with the most available fields for a
given line-format is used. For example, if the first
log message has 8 fields and format A contains 5 of
those fields in its line-format while format B only
contains 2 of those fields in its line-format, format
A will be used for the file.

For JSON-lines logs, line-feeds at the end of a value are
automatically stripped.

Hidden values in JSON logs are now hidden by default.
Text with ANSI-escapes is now filtered properly.