add floating window setting (#8279)

* Set `disable-floating-window` in client ui, it shows enabled when
  option is enabled and has floating window permission.
* Remove ignore battery setting because not work on every device.
* When the phone orientation changes, make the Y coordinate change
  proportionally, when changing back, the floating window position is still the original one.
* Add custom client option `floating-window-untouchable` to make the
  click event pass through the floating window automically. Set it untouchable automically when transparency is 0.
* On my phone, floating window size 16 no works and 32 works, so keep
  the size range [32, 320]

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/lang/cn.rs

@@ -615,5 +615,7 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("android_new_voice_call_tip", "收到新的语音呼叫请求。如果您接受，音频将切换为语音通信。"),
         ("texture_render_tip", "使用纹理渲染，使图片更加流畅。 如果您遭遇渲染问题，可尝试关闭此选项。"),
         ("Use texture rendering", "使用纹理渲染"),
+        ("Floating window", "悬浮窗"),
+        ("floating_window_tip", "有助于保持RustDesk后台服务"),
     ].iter().cloned().collect();
 }