feat: Make recent webapps compatible with old URL configs

[bennycode]

Current situation
The current config code sets URL to what is given by env.URL or a set of default values.

Problem
When you are now launching the webapp with a very old configuration, then env.URL might not have entries like URL.SUPPORT.HISTORY, so our code fails at statements like Config.getConfig().URL.SUPPORT.HISTORY.

Solution
To make new Wire web app versions compatible with old configs, we can set URL to a set of defaults first and then spread the config properties of our custom (old) config into the config object. Thus it will be guaranteed that we have a config with meaningful default values.

Real-World Scenario
I ran into this problem by using a webapp version (commit ID 14ee262) from 2021 with a config from 2020.

• My old config:

window.wire = window.wire || {};
window.wire.env = {
  ANALYTICS_API_KEY: '',
  APP_NAME: 'Webapp',
  BACKEND_REST: 'https://prod-nginz-https.wire.com',
  BACKEND_WS: 'wss://prod-nginz-ssl.wire.com',
  BRAND_NAME: 'Wire',
  ENVIRONMENT: 'production',
  FEATURE: {
    ALLOWED_FILE_UPLOAD_EXTENSIONS: ['*'],
    APPLOCK_SCHEDULED_TIMEOUT: null,
    APPLOCK_UNFOCUS_TIMEOUT: null,
    CHECK_CONSENT: true,
    DEFAULT_LOGIN_TEMPORARY_CLIENT: false,
    ENABLE_ACCOUNT_REGISTRATION: true,
    ENABLE_DEBUG: false,
    ENABLE_DOMAIN_DISCOVERY: true,
    ENABLE_PHONE_LOGIN: true,
    ENABLE_SSO: true,
    PERSIST_TEMPORARY_CLIENTS: true,
    SHOW_LOADING_INFORMATION: false,
  },
  MAX_GROUP_PARTICIPANTS: 500,
  MAX_VIDEO_PARTICIPANTS: 4,
  NEW_PASSWORD_MINIMUM_LENGTH: 8,
  RAYGUN_API_KEY: '',
  URL: {
    ACCOUNT_BASE: 'https://account.wire.com',
    MOBILE_BASE: '',
    PRIVACY_POLICY: 'https://wire.com/security',
    SUPPORT_BASE: 'https://support.wire.com',
    TEAMS_BASE: 'https://teams.wire.com',
    TERMS_OF_USE_PERSONAL: 'https://wire.com/legal/terms/personal',
    TERMS_OF_USE_TEAMS: 'https://wire.com/legal/terms/teams',
    WEBSITE_BASE: 'https://wire.com',
  },
  VERSION: '2020-02-14-13-07',
  APP_BASE: 'https://app.wire.com',
};

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