Inventory system upgrade — Hyperspacer Steam update #272320

- Further optimization of the code, for better performance of the game - Inventory system upgrade: from now on, only items that the player owns will be visible. The other tiles in the list will be blanked out. Also added a small description of each page in the inventory, such as “weapons” or “minerals”. The new system should be less stinging to the eyes and will allow the player to better assess the possessions. ------------------------------------------------------------------------------------------------- Future plans: - I am thinking about a new quest system. All quests would only be done once from now on, but there would be more of them. I should also develop a multi-quest journal. - I am thinking of expanding the main quest. More characters, more story. - I might increase the spawns on the planets. Sometimes i...