Manual update to v.1.5

Changes:

• corrected Book Sets 01-06 DO have an inventory, 07-10 are no containers. Adapted annotations for 07-10
• updated chapter 7.8 Swimming items to reflect the need to place items on the very ground under water
• chapter 2.5 Add-Ons - explains the add-on mods "SvS Ext Unlock RCP Feats" and "SvS Ext Permanent Feats".
• adding SvS2 patch content up to v1.5.2
• adding SvS2 patch content up to v1.3.2
• sources updated
• updated the credits chapter