[Enhancement] Make Auto start league client available for Riot client

[YingLingWei]

功能描述

It would be awsome if you could manage to get the auto start league client working on Riot client

在提交之前，请您确认

• 我已经查看了之前（包括已经关闭）的 issues，其中并没有与我相同的想法

[BakaFT]

1> All RCs installed is listed in %PRGRAMDATA%\Riot Games\RiotClientInstalls.json 's associated_client object

{
    "associated_client": {
        "d:/wegameapps/英雄联盟/riot client/../LeagueClient/": "d:/wegameapps/英雄联盟/riot client/riotclientservices.exe"
    },
    "patchlines": {
        "KeystoneFoundationTencentLeagueLivePublicWin": "d:/wegameapps/英雄联盟/riot client/riotclientservices.exe"
    },
    "rc_default": "d:/wegameapps/英雄联盟/riot client/riotclientservices.exe"
}

2> can launch the game together with RC through command line args
ref: https://github.com/molenzwiebel/Deceive/blob/master/Deceive/StartupHandler.cs#L136

It's possible to do that but I haven't walk through seraphine codebase so hope somebody can handle this