scrcpy v1.15

Changes since v1.14:
 - Forward Ctrl and Shift to the device (#1598, #555, #942)
 - Change "resize to fit" shortcut from MOD+x to MOD+w (#1598)
 - Make shortcut modifiers customizable (#1598)
 - Restore power mode to "normal" on disconnection (#1572, #1576)
 - Keep the screen off on powering on (best effort) (#1573, #1577)
 - Add option to disable screensaver (#1370, #1502)
 - Do not crash on missing clipboard manager (#1440, #1556)
 - Fix touch events HiDPI-scaling (#1536, #15)
 - Correctly inject repeating keycodes (#1013, #1519)
 - Add option to ignore repeated key events (#1013, #1623)
 - Increase clipboard size from 4k to 256k (#1117)
 - Do not expose internal SDL logs to users (#1441)
 - Upgrade platform-tools to 30.0.4 (adb) in Windows releases
 - Upgrade FFmpeg to 4.3.1 in Windows releases