Swaylock-effects 1.6-2

• Merge in changes from upstream.
• Add --submit-on-touch (thanks to Zocker1999NET).
• Add --time-effects to show how long each effect takes to run.
• Add automatic compilation of custom effects.
  With --effect-custom /path/to/effect.c, swaylock-effects will automatically
  compile (or recompile) that effect if necessary.
  Cached compile artefacts are stored in ~/.cache/swaylock/.
• Fix an issue that would make the screenshot image appear oriented incorrectly
  with some set-ups.
• Fix how swaylock-effects deals with displays which are added and removed
  while swaylock-effects is running.
• Fix --daemonize (-f) in combination with --fade-in.
  The parent process used to exit before the fade-in animation is complete;
  now, the parent process will only exit after the fade-in.
• Fix how effects deal with scaling. The blur effect, the compose effect
  and the pixelate effect will now multiply any radius and position parameters
  with the output's scale.
• Custom effects's swaylock_effect function signature has changed to
  void swaylock_effect(uint32_t *data, int width, int height, int scale),
  where scale is the scale of the output the effect is being applied on.
  The function previously didn't take a scale argument.
• Other minor fixes and improvements.

Work with upstream:

• A use-after-free in upstream swaylock is fixed.
• A pull request to handle images as outputs are dynamically added and removed
  is sent upstream.
  The PR isn't merged yet, but the fix is now in swaylock-effects.