[Feat] Add DLCs manager for Epic Games

[flavioislima]

This PR adds the ability to:

• Select individual DLCs to be installed for Epic games, instead of installing all or nothing.
• Adds a new item on the Game Page SubMenu to open a DLC manager dialog where is possible to install and uninstall available DLCs.
• Works only for Epic for now, GOG keeps the current behavior until GogDL adds this feature as well.
• When selecting the DLCs on the install dialog, they will be added to the download Queue just after the main game.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[arielj]

I'm testing installing the alien game with its only DLC and there's no indication in the downloads that it includes the DLC

I think it's because since it's all the DLCs it has and it's just passing the --with-dlcs flag then it's not adding the DLCs as extra downloads which makes sense to me but maybe we can add a (with all DLCs) after the name in these cases?

like: Alien: Isolation (with all DLCs)

[arielj]

one issue I noticed is that it's installing all DLCs if none is selected

I tried installing The Messenger without picking the picnic DLC and the install command has the --with-dlcs and then the when I open the DLCs dialog it shows as installed

[arielj]

another issue I noticed (but this one shouldn't be a blocker) is that you can click a DLC in the completed list in the download manager and it takes you to the specific DLC's details page instead of the parent's page

for example, I installed the messenger DLC individually so I have the picnic panick entry in the download manager, I click that and it takes me to the picnic panic game details page but its play button doesn't work, then I go back and launch the base the messenger game and it works ootb

I think we should redirect to the DLC's parent if the game we are opening the GamePage is actually a DLC to avoid issue (I think many of the three dots menu options will fail or do weird stuff for DLCs -like moving the game-)

I think it's not a blocker (can be handled outside this PR) but would be nice if it's easy to fix

[flavioislima]

@ariel, those issues with the messenger and alien isolation are for Epic games? GOG we still pass the flag but for epic games, we won't. In my tests here, Dying Light Enhanced edition, for instance, has 2 DLCs, if I select All DLCs it adds the 2 to the queue as expected.

But for GOG games, it will pass the flag to install all.

EDIT: Ok, I think I forgot to remove the flag from the legendary install command. Will push a fix to it.

[flavioislima]

another issue I noticed (but this one shouldn't be a blocker) is that you can click a DLC in the completed list in the download manager and it takes you to the specific DLC's details page instead of the parent's page

for example, I installed the messenger DLC individually so I have the picnic panick entry in the download manager, I click that and it takes me to the picnic panic game details page but its play button doesn't work, then I go back and launch the base the messenger game and it works ootb

I think we should redirect to the DLC's parent if the game we are opening the GamePage is actually a DLC to avoid issue (I think many of the three dots menu options will fail or do weird stuff for DLCs -like moving the game-)

I think it's not a blocker (can be handled outside this PR) but would be nice if it's easy to fix

For now I will disable the click on DLCs and also remove the action icons:

[arielj]

looking good! all my comments are addressed and the feature works correctly for me 👍

I tested installing and uninstalling games on both gog windows/linux and epic, installing with and without DLCs for Epic and installing/uninstalling DLCs for epic after a game is installed