Better install instructions

[class101]

Hey developers,

This is related to issue #225 but I wanted to add some additional informations not just Linux related because you are also having Windows users getting troubles

The general consensus I collected about your installation instruction is that they are unclear and lacking informations

I created a Steam guide and based on the feedback I received from it, this approach was well-received, I got more than 50 upvotes in the SteamDeck sub-reddit for example, there is a demand of clarity on what you are building

(The conflict warning about both HD mods is very appreciated for example, it clears things up)

I suggest you:

• Adjust problems of default options but not just for Windows in mind but all operating systems, TextureFilter=1 conflicts with SCALE_2X=1 and must be set to 0 to play upscaled (playing upscaled I bet is what everyone is looking for)
• UAC_AWARE should not be ON by default because this is the root cause of a lot of confusions under Linux, I'm sure you are capable of detecting yourself permission denied into Windows and forcing it to 1 when it is clearly needed
• Get rid of undat.sh
• Get rid of SteamDetour.exe, clearly a poor design choice and a misstep. If you need to ask Windows to load the redistributed ddraw.dll, you must provide a .manifest file alongside the ddraw.dll, not a SteamDetour. Look at how vcredist dlls are bundled into applications; they are always accompanied by a manifest file to allow Windows to load the appropriate copy in a non-standard directory
• Consider linking to or borrowing instructions from my Steam guide because it contains everything for Linux and the Steam Deck, without using Wine, undat.sh, additional EXE and it just works : https://steamcommunity.com/sharedfiles/filedetails/?id=3230745043

For example, setting SCALE_2X=1 with your default settings will result in the following pixel problems until turning TextureFilter OFF and it is difficult to find this root cause