Some added features:
- Configurable timeout for typing bubble (will check window.typingBubbleTimeout, default to 2000s)
- imBack card action click will render the button title (not the button value) in the client
- loading element on bot first start
- Disable old card buttons (for postBack or imBack), this is configurable through global variable in Window
- 'window.enableOldButtons' flag to set enable/disable old buttons, default to false
- 'window.lastIndexDisableButtons' flag to configure which new buttons to be enabled, e.g. if set to 2, only the last 2 message bubble buttons will be enabled