Move MSA Client ID to the same place as the others

MSA Client ID has been moved to CMakeLists.txt, and defaults to the
Client ID for the PolyMC application.

Removed secrets/notsecrets library, replace with (temporary?)
program_info subdirectory.

launcher/Application.cpp

@@ -76,8 +76,6 @@
 #include <ganalytics.h>
 #include <sys.h>
 
-#include <Secrets.h>
-
 
 #if defined Q_OS_WIN32
 #ifndef WIN32_LEAN_AND_MEAN
@@ -1559,10 +1557,6 @@ void Application::on_windowClose()
     }
 }
 
-QString Application::msaClientId() const {
-    return Secrets::getMSAClientID('-');
-}
-
 void Application::updateProxySettings(QString proxyTypeStr, QString addr, int port, QString user, QString password)
 {
     // Set the application proxy settings.