Add alternative method for initializing a client with some settings

[lcsmuller]

Describe the feature

Add an alternative method for initializing a client with some settings (such as logging), without requiring the config.json file. This would add greater flexibility to the user, as they might use their own custom logic for parsing of their configuration fields.

Possible implementation:

struct discord_settings settings = {
  .token = BOT_TOKEN,
  .prefix = "!",
  .logging = {
    .level = DISCORD_LOG_LEVEL_TRACE,
    .filename = "bot.log",
    .quiet = false,
    .http = "http.log",
  },
};
struct discord *client = discord_settings_init(&settings);

Acceptance criteria

• Allows all options currently available at config.json
• Modify discord_config_init() to be calling this new method underneath

Version

v2.1.0