Feature/warnings (#1885)

Remove many warnings from MSVC, Clang, and GCC

modules/sync/syncmodule.cpp

@@ -44,10 +44,6 @@
 #include "syncmodule_lua.inl"
 
 namespace {
-    constexpr const char* KeyHttpSynchronizationRepositories =
-        "HttpSynchronizationRepositories";
-    constexpr const char* KeySynchronizationRoot = "SynchronizationRoot";
-
     struct [[codegen::Dictionary(SyncModule)]] Parameters {
         // The list of all repository URLs that are used to fetch data from for
         // HTTPSynchronizations

modules/sync/syncs/httpsynchronization.cpp

@@ -35,9 +35,6 @@ namespace {
 
     constexpr const char* TempSuffix = ".tmp";
 
-    constexpr const char* QueryKeyIdentifier = "identifier";
-    constexpr const char* QueryKeyFileVersion = "file_version";
-    constexpr const char* QueryKeyApplicationVersion = "application_version";
     constexpr const int ApplicationVersion = 1;
 
     struct [[codegen::Dictionary(HttpSynchronization)]] Parameters {