Enemy on library, change camera position, life level reduced, some fixes

[img]{STEAM_CLAN_IMAGE}/38681054/f2440d2088a43142ec63a3ca73f4351ea0eccfeb.png[/img] [list] [*] Camera: option to change the position of the camera, centering, or moving it to the right or left [*] Library: now an enemy will always appear in it [*] Library: Fixed Treasure Spawn [*] Smith Room: Fixed bug that made it impossible to pick up the gun sometimes [*] Now the life increase for each level has been halved [*] Backstab: corrected calculation, as it wasn't taking into account the character's strength when executing the attack [*] Fixed the end-game scene, as unexpected behavior sometimes occurred [*] Reduced map border size [/list]