Implement Support for cl_crosshair_t Command

[JohnDeved]

Goal of this PR

This PR aims to implement support for the cl_crosshair_t command from CS:GO. The cl_crosshair_t command allows players to customize their crosshair to a "T" style by removing the top line of the crosshair.

How is this PR achieving the goal

• Command Implementation: Added the cl_crosshair_t command to toggle the "T" style crosshair.

  static ConVar<bool> cl_crosshair_t("cl_crosshair_t", ConVar_Archive, false);

• Drawing Logic Update: Modified the DoCrosshairDraw function to conditionally skip drawing the top vertical line of the crosshair when cl_crosshair_t is enabled.

  // draw top vertical crosshair line if cl_crosshair_t is disabled
  if (!cl_crosshair_t.GetValue())
  {
      int iInnerTop = iCenterY - iInnerCrossDist - iBarThickness / 2;
      int iOuterTop = iInnerTop - iBarSizeInner;
      DrawCrosshairRect(r, g, b, flLineAlphaInner, x0, iOuterTop, x1, iInnerTop, bAdditive);
  }

• Whitelist Update: Added cl_crosshair_t to the g_prodCommandsWhitelist to ensure the command is recognized and can be used.

  static std::vector<std::string> g_prodCommandsWhitelist{
      ...
      "cl_crosshair_t" // Added command
  };

This PR applies to the following area(s)

• FiveM

Successfully tested on

Game builds:

Platforms: Windows

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.