fix: Gracefully handle steam as underlay in overlay mode via launch options

[KyleGospo]

Disables most TDP control when --steamos-manager is specified, this otherwise conflicts with SteamOS-Manager and causes TDP to always apply the OGUI options unless the Steam QAM is open

Additionally fixes a bug with user defined controllers being ignored, sets the default controller to steam deck in overlay mode, allows device configs to override that default if something like Xbox is required for their hardware, and disables per game controller configs when --steam-input is specified.

[KyleGospo]

Squashed into a single PR per @pastaq

[pastaq]

Before I merge this I want to get input from @GloriousEggroll as this will affect Nobara. AFAIK they are not using SteamOS Manager at this time. If thy aren't going to add OGC steamos-manager we might need to consider passing a new CLI arg in the session instead.

[pastaq]

Looking again at patch 3, that won't work for some devices. Notably there are some devices that don't have a dedicated QAM button. The GPD Win 4 is a popular example. With the deck, deck-uhid, and horipad targets Steam doesn't respond to guide+a to open the QAM. This leaves those users with no way to open the Steam QAM.

We have a couple of options for a different approach. Option 1 is to led OpenGamepadUI respect the SteamOS Manager set target device if a profile target isn't set. This is close to the current behavior already, though we'd reintroduce the resume issue and would need to figure out a solution for that.

The other option would be to let an OpenGamepadUI platform specify a target to override the default target. This would require adding platforms for every affected device.

[KyleGospo]

I like the override by platform, and if needed for nobara the steam underlay stuff can become it's own launch option

[GloriousEggroll]

the steamdeck tdp only applies to the deck itself afaik -- why are we disabling ogui tdp control? in nobara we just disable the overlay for steam deck ie if steamdeck, launch without ogui, else launch with ogui.

literally the only time you need the ogui overlay is on non-steamdeck devices

[pastaq]

the steamdeck tdp only applies to the deck itself afaik -- why are we disabling ogui tdp control? in nobara we just disable the overlay for steam deck ie if steamdeck, launch without ogui, else launch with ogui.

Vanilla SteamOS Manager does TDP for Legion, MSI, and Asus devices as well.
OGC SteamOS Manager connects to Power Station for everything else. This enables the steam TDP and GPU Clock sliders in steam itself to function fully. OpenGamepadUI can then just provide extra options not controlled by Steam.

literally the only time you need the ogui overlay is on non-steamdeck devices

[KyleGospo]

@pastaq As requested this is now split into two separate launch options
--steamos-manager gates the TDP changes, and --steam-input gates the controller profile changes minus the deck-uhid default change and default-controller-in-profile change, both of which are useful even in a full OGUI session.