runelite-api: add setVar for setting varclientstr

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -625,6 +625,14 @@ public interface Client extends GameEngine
 	 */
 	String getVar(VarClientStr varClientStr);
 
+	/**
+	 * Sets the given variable
+	 *
+	 * @param varClientStr
+	 * @param value
+	 */
+	void setVar(VarClientStr varClientStr, String value);
+
 	/**
 	 * Sets the value of a given variable.
 	 *

runelite-mixins/src/main/java/net/runelite/mixins/VarbitMixin.java

@@ -126,6 +126,14 @@ public abstract class VarbitMixin implements RSClient
 		return getStrVarcs()[varClientStr.getIndex()];
 	}
 
+	@Inject
+	@Override
+	public void setVar(VarClientStr varClientStr, String value)
+	{
+		String[] vars = getStrVarcs();
+		vars[varClientStr.getIndex()] = value;
+	}
+
 	@Inject
 	@Override
 	public int[] getIntVarcs()