Move data/ to app/

The files in data/ are specific to the client app (not the server).

This also avoids to reference the parent directory (../) from
app/meson.build.

Refs 8d583d36e2

app/data/scrcpy-console.bat

@@ -0,0 +1,4 @@
+@echo off
+scrcpy.exe %*
+:: if the exit code is >= 1, then pause
+if errorlevel 1 pause