Add option to specify the initial window position

Add --window-x and --window-y parameters.

Signed-off-by: Romain Vimont <rom@rom1v.com>

app/src/scrcpy.h

@@ -18,6 +18,8 @@ struct scrcpy_options {
     uint16_t port;
     uint16_t max_size;
     uint32_t bit_rate;
+    int16_t window_x;
+    int16_t window_y;
     bool show_touches;
     bool fullscreen;
     bool always_on_top;
@@ -38,6 +40,8 @@ struct scrcpy_options {
     .port = DEFAULT_LOCAL_PORT, \
     .max_size = DEFAULT_LOCAL_PORT, \
     .bit_rate = DEFAULT_BIT_RATE, \
+    .window_x = -1, \
+    .window_y = -1, \
     .show_touches = false, \
     .fullscreen = false, \
     .always_on_top = false, \