Closes #5592

There is no need to use the `else` since the `if` statement returns implicitly.

* moving from coffee to js

* renaming method

- Gets the link based on room type using user's subscription data
- Do not loop over subscriptions for rooms without custom link

- Add ability to livechat customers to close the chat session
- Send data to CRM on any livechat edit action
- Add new livechat callbacks: `livechat.saveGuest`, `livechat.saveRoom` and `livechat.saveInfo`
- Rename livechat callbacks:
  - `closeLivechat` -> `livechat.closeRoom`
  - `sendOfflineLivechatMessage` - `livechat.offlineMessage`
- Rename method `livechat:saveLivechatInfo` to `livechat:saveInfo`
- Save CRM returned data
- Add option to override the input box template