fix: refine TTY switching

[calsys456]

1. Add callback for disableRender, to ensure render is exactly disabled before DDM doing further actions;
2. Revoke all evdev devices before VT switch (at disableRender()), to prevent accidental input events during switch;
3. Refine logic of switchToUser, take care of showing lockscreen after switch;
4. Make event function args const

PR for ddm: linuxdeepin/ddm#39
PR for treeland-protocol: linuxdeepin/treeland-protocols#23

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This pull-request has been approved by: apr3vau, zccrs

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