Move cards and filters folder out of game (#6145)

* big move

* also move game_specific_terms

* fix imports

* alphabetize cmake

* fix build failure

* create database folder and move files into it

* fix includes

* run formatter

cockatrice/src/database/card_database_manager.cpp

@@ -0,0 +1,7 @@
+#include "card_database_manager.h"
+
+CardDatabase *CardDatabaseManager::getInstance()
+{
+    static CardDatabase instance; // Created only once, on first access
+    return &instance;
+}