Leaders: AoH2:DE can now read leaders from AoH3

[Łukasz Jakowski 13,396]

AoH2:DE can now read leaders from AoH3, and they can be stored in both the old AoH2 format and the new AoH3 format in JSON files.

Reading of JSON leaders must be enabled first in gvLeader.json

ENABLE_JSON_LEADERS: true,

By default, it is disabled.

Put the JSON files in game/leaders/ and the images, as before, in game/leadersIMG/

Example: lao.json

{
    Rulers: [
        {
            Name: "Thongloun Sisoulith",
            ImageID: 122,
            
            BornDay: 10,
            BornMonth: 11,
            BornYear: 1945,
            
            ReignYear: 2021,
        },
    ],
    
    Age_of_History: Rulers
}