fix StartupMessages; implement messages from master

[mxve]

What does this PR do?

• Fixed StartupMessages
  • Fixed some logic errors
  • Created StartupMessages::Show
    • I could not determine how StartupMessages was initially meant to be called and I couldn't find it in the git history either, I assume it was called through menus at some point.
    • With the changes it should be possible to call StartupMessages::Show at a later point and re-use it to display information to the user, but this is untested
  • Added StartupMessages::Show to checkFirstLaunch UIScript which gets called by the main menu
• Added overload for StartupMessages::AddMessage(message, title) to allow setting a title
• Added startup messages retrieved from the master at https://iw4x.getserve.rs/v1/info
  • Verified that json parsing doesn't fail if content mismatches/no internet connection
• Changed void Changelog::LoadChangelog() to void Changelog::SetChangelog(const std::string& changelog)
  • The original function was already called from News, it now passes the changelog content too, which allows for the next change
• Combined motd, changelog and the new startup message web requests into a single request

How does this PR change IW4x's behaviour?

Anything else we should know?

In case the master should be down/inaccesible to maintainers there's still the fallback url https://raw.githubusercontent.com/iw4x/iw4x-cache which should take priority over the master url. To use it the repository has to be created and an "info" file has to be created with content like this:

{
   "motd":"Message of the day text",
   "popmenu":[
      {
         "title":"Everyone",
         "message":"This message is displayed
to every IW4x revision (after this is merged)",
         "revisions":[
            "any"
         ],
         "show":true
      },
      {
         "title":"Specific rev",
         "message":"This message is only displayed to revision r4809",
         "revisions":[
            "r4809"
         ],
         "show":true
      }
   ],
   "changelog":"What's changed in r4794 (client) | 2025-01-09\n* Fix gamepad performance\n\nWhat's changed in r4773 (client) | 2024-12-13\n* Fixed a security issue that allowed servers to send malicious commands to the game. This issue potentially affects other CoD games aswell.\n\nWhat's changed in r4768 (client) | 2024-12-08\n* Fix performance issues waiting on controller IO at a very high framerate\r\n* Fix of fps drop when using a high polling rate mouse\r\n* Wait for inputs to be read before reading them again\r\n* Fix editorconfig misconfiguration\r\n* Use master node for changelog and motd\r\n* Feat/improve exceptions\r\n* fix: make .str parsing with ZB useful\r\n* fixed codol LOD"
}

special thanks to wroy and louve for explaining c++ basics multiple times c:

[wroyca]

A little too excessive on the if HasMember && IsType machinery for my taste, and it seems odd to me that RapidJSON doesn't validate the type in its getters by default. Perhaps it would make sense to write a utility like the following:

class JsonHelper
{
public:
  explicit
  JsonHelper (const rapidjson::Value& value) : json (value) {}

  bool
  HasAllKeys (const std::initializer_list<std::string_view>& keys)
  {
    return std::ranges::all_of (keys,
                                [this] (std::string_view key)
    {
      return json.HasMember (key.data ());
    });
  }

  std::optional <std::string>
  GetString (const std::string_view key) const
  {
    if (json.HasMember (key.data ()) && json[key.data ()].IsString ())
      return json[key.data ()].GetString ();

    return std::nullopt;
  }

private:
  const rapidjson::Value& json;
};

But overall, it's not that important. That said, one change I want to see here is a comment section, potentially at the beginning of the file, to explain the popup machinery, with perhaps an example and, more importantly, documentation on how it handles invalid cases

Minus that, lgtm, thank! 🥳

[mxve]

Additional change, updated website url used in the main menu to https://alterware.dev

iw4x-client/src/Components/Modules/News.cpp

Line 132 in 4b5dc52

Utils::OpenUrl("https://alterware.dev");

[mxve]

We should also decide whether we want to keep the 2 current startup messages

iw4x-client/src/Steam/Steam.cpp

Line 128 in a81e7b3

Components::StartupMessages::AddMessage("Warning:\nUnable to connect to Steam. Steam features will be unavailable");

iw4x-client/src/Components/Modules/Maps.cpp

Line 611 in a81e7b3

StartupMessages::AddMessage("Warning:\n You only have some of DLCs 3-5 which are all required to be installed to work. There may be issues with those maps.");

[Rackover]

Code looks good.
Tested it and it runs as it should, no side effects as far as I can see.

Before merging: Please remove the "missing steam" startup message if that's okay
And don't abuse your newfound power of displaying random stuff in front of the users 😂

[Rackover]

whoopsie please solve merge conflict