Manager: Convert package class to singleton

src/main.cpp

@@ -83,19 +83,17 @@ int main(int argc, const char* argv[])
 		}
 	}
 	else if (packageOperation) {
-		Package package;
-
 		if (addOrAur) {
-			package.aurInstall();
+			Package::the().aurInstall();
 		}
 		if (install) {
-			package.install();
+			Package::the().install();
 		}
 		if (pushOrStore) {
-			package.store();
+			Package::the().store();
 		}
 		if (!addOrAur && !install && !pushOrStore) {
-			package.list(targets);
+			Package::the().list(targets);
 		}
 	}
 	else if (helpOperation) {

src/package.cpp

@@ -20,7 +20,7 @@
 #include "util/shell.h"
 #include "util/system.h"
 
-Package::Package()
+Package::Package(s)
 {
 }
 

src/package.h

@@ -11,9 +11,11 @@
 #include <string>
 #include <vector>
 
-class Package {
+#include "util/singleton.h"
+
+class Package : public Util::Singleton<Package> {
 public:
-	Package();
+	Package(s);
 	virtual ~Package();
 
 	enum class Distro {