Add tools list

[zpiddock]

Work required:-

• Rework mod list and games list in to a custom List implementation, can then use generics to specify the type.
• Add new ToolsList similar to mod list and games list:
• Tools list will be stored in the mod store, next to the mods.json named tools.json
• Add GUI to add tools

{
    "tools": [
        {
             "Name": "",
             "Icon": "",
             "RunConfig": ""
        }
    ]
}

Name is the display name of the tool,
Optional icon file to display,
Name of the run config to find in the "tools" folder

Run configs will be a json representation of the RunConfig class.