fix: handle timeout issues in splashscreen (VO-231)

[acezard]

This fix introduces several changes in splashscreen failsafe management:

• More logging
• Initial timer on "global" to handle scenarios where no showSplashScreen() are called
• Use a map to allow multiple timers coexisting
• On background handling (delete every timer)
• On active handling (reset timers that existed before going to background to the timeout value, this will allow us to ignore all problems related to unreliable timeout in background mode, remember that these timeout should not be needed in normal circumstances)

Examples

Normal flow:

Going from active to background to active

On this one I had a bug (linked to hot reloading so can't say exactly what happened), but we can still see the timeout managed the issue in the end