Problem:    There is no easy way to translate a string with a key code into a
            readable string.
Solution:   Add the keytrans() function. (closes #11114)

Problem:    SubRip files are not recognized.
Solution:   Add a pattern for SubRip. (closes #11113)

Problem:    Using :echowin while at the hit-enter prompt causes problems.
Solution:   Do not prompt for :echowin.  Postpone showing the message window.
            Start the timer when the window is displayed.

Problem:    Message window may be positioned too low.
Solution:   Compute cmdline_row before computing the position.

Problem:    When opening/closing window text moves up/down.
Solution:   Add the 'splitscroll' option.  When off text will keep its
            position as much as possible.

Problem:    Trying to declare g:variable gives confusing error.
Solution:   Give a better error message. (closes #11108)

Problem:    Blueprint files are not recognized.
Solution:   Add a pattern for blueprint files. (Gabriele Musco, closes #11107)

Problem:    Virtual text "above" doesn't handel line numbers.
Solution:   Take the left column offset into account. (issue #11084)
            Also make padding work.

Problem:    Closure in for loop test fails on some systems.
Solution:   Do not wait for the ruler to show up. (issue #11106)

Problem:    Crash when using mkdir() with "R" flag in compiled function.
Solution:   Reserve a variable for deferred function calls.  Handle more than
            one argument.