scrcpy v1.2

Changes since v1.1:
 - Increase connection attempts (fix issues over TCP/IP)
 - Fix process hanging on Ctrl+C during initialization
 - Add shortcut (Ctrl+m) for MENU key (#85)
 - Add option (-t/--show-touches) to enable "show touches" (#96)
 - Fix double-click events (#97)
 - Change volume shortcuts (Ctrl+UP and Ctrl+DOWN) (#103)
 - Map numpad ENTER key (#117)
 - Add feature to install APK files via drag & drop (#133)
 - Change the Windows build (cross-compile from Linux)
 - Generate both console and noconsole versions (fix "no output" issue)