Dynamic content loader

[Bravo555]

Make a dynamic content loader. Needs to be able to hotswap resources and decrypt downloadable content (dlc).

[Bravo555]

Feature spec

Parts

• PozaziemscyZaborcy-dlc-utils - library with encoding/decoding and encrypting/decrypting utilities. Remaining parts will be using functionality from this library.
• PozaziemscyZaborcy-dlc-bin - binary (actually python script) for managing, preparing and depacking dlcs.
• the part that will be included in main game code. Will decrypt and unpack dlcs from dlc directory.

DLC format

.dlc files in dlc directory will actually be .zip files, locked with a password.
In the archive itself, there will be texture files, and dlc.json file, with a following format:

{
    "textures": {
        "enemyShip": "path/to/enemy_texture.png",
        "playerShip": "path/to/player_texture.png"
    },
    "music": [
        "path1.mp3", "path2.mp3", "path3.mp3"
    ]
}

PozaziemscyZaborcy-dlc-bin will be used to convert directory with dlcs files to a prepared dlc archive and vice versa. (mainly for development and debugging purposes).