Hover settings (1/2)

- Require full screen mode;
- Hide non-clearable;
- Exclude low priority;

Original commits
https://github.com/TheKang/frameworks_base/commit/598fa9d46e84b563d9ec6ffa75a38da9fc3cc5a9
https://github.com/TheKang/frameworks_base/commit/a3b44ef4fce7cdabc477075ac646b596dc0f83a4

Thanks @Der-Schubi

Change-Id: If3c34496acf75d49434902c49dfe48f997c0b668