kitty: Update to 0.15.0

Various pkgsrc changes aiming to reduce the complexity of this package
and make it less error-prone, in spite of the very weird homebrew build
system.

0.15.0 [2019-11-27]

    Add a new action detach_window that can be used to move the current window into a different tab (#1310)

    Add a new action launch that unifies launching of processes in new kitty windows/tabs.

    Add a new style powerline for tab bar rendering, see tab_bar_style (#2021)

    Allow changing colors by mapping a keyboard shortcut to read a kitty config file with color definitions. See the FAQ for details (#2083)

    hints kitten: Allow completely customizing the matching and actions performed by the kitten using your own script (#2124)

    Wayland: Fix key repeat not being stopped when focus leaves window. This is expected behavior on Wayland, apparently (#2014)

    When drawing unicode symbols that are followed by spaces, use multiple cells to avoid resized or cut-off glyphs (#1452)

    diff kitten: Allow diffing remote files easily via ssh (#727)

    unicode input kitten: Add an option kitty +kitten unicode_input --emoji-variation to control the presentation variant of selected emojis (#2139)

    Add specialised rendering for a few more box powerline and unicode symbols (#2074 and #2021)

    Add a new socket only mode for allow_remote_control. This makes it possible for programs running on the local machine to control kitty but not programs running over ssh.

    hints kitten: Allow using named groups in the regular expression. The named groups are passed to the invoked program for further processing.

    Fix a regression in 0.14.5 that caused rendering of private use glyphs with and without spaces to be identical (#2117)

    Wayland: Fix incorrect scale used when first creating an OS window (#2133)

    macOS: Disable mouse hiding by default as getting it to work robustly on Cocoa is too much effort (#2158)

(nia)