Rework `-vanilla` to be a vanilla compatibility mode (#601)

Old `-vanilla` behaviour is now handled by `-nonorthstardll`.

New squirrel constant called `VANILLA`. Set to true when in vanilla compatibility mode.

Differences when in vanilla compatibility mode:
- Doesn't restrict server commands (same as `-norestrictservercommands`)
- Doesn't block FairFight screenshot functions 
- Doesn't do Atlas-related stuff (except for mainmenupromos)

1 files changed, 29 insertions, 0 deletions

diff --git a/NorthstarDLL/core/vanilla.h b/NorthstarDLL/core/vanilla.h
new file mode 100644
index 00000000..fb809a1a
--- /dev/null
+++ b/NorthstarDLL/core/vanilla.h
@@ -0,0 +1,29 @@
+#pragma once
+
+/// Determines if we are in vanilla-compatibility mode.
+/// In this mode we shouldn't auth with Atlas, which prevents users from joining a
+/// non-trusted server. This means that we can unrestrict client/server commands
+/// as well as various other small changes for compatibility
+class VanillaCompatibility
+{
+  public:
+	void SetVanillaCompatibility(bool isVanilla)
+	{
+		static bool bInitialised = false;
+		if (bInitialised)
+			return;
+
+		bInitialised = true;
+		m_bIsVanillaCompatible = isVanilla;
+	}
+
+	bool GetVanillaCompatibility()
+	{
+		return m_bIsVanillaCompatible;
+	}
+
+  private:
+	bool m_bIsVanillaCompatible = false;
+};
+
+inline VanillaCompatibility* g_pVanillaCompatibility;