ItemList.xlsx: Added many more items

Signed-off-by: Dasaan <mrloquax@googlemail.com>
ItemList.xlsx: Added more items to the master list

Signed-off-by: Dasaan <mrloquax@googlemail.com>
AnalyseStructure.bas: Added more code to handle player inventories
Constants.bas: Updated version number
Constants.bas: fixed comments
Constants.bas: Added constant to reference the new items tab
DataTypes.bas: Added data type to hold master item data
ESS.bas: Reordered structures and added an item list to the player section
GlobalVariables.bas: Added an array to hold the master item list
ItemList.xlsx: Corrected some mistakes in the item data template
Items.data: Updated the distributed item list from the template file
OSE.iss: Added an icon to the installer
frmMain.frm: Added the beginnings of the player inventory GUI
frmMain.frm: Continued work on handling the player inventory

Signed-off-by: Dasaan <mrloquax@googlemail.com>