[FEATURE REQUEST] Add Configuration Support

[tungs]

Is your feature request related to a problem? Please describe.
In the future, it'd be useful to be able to configure timeweb

Describe the solution you'd like
Either or both of:

• A user-definable variable, something like: <script> var timewebConfig = {...}</script> that is occurs before the inclusion of timeweb.js
• A method in timeweb to configure these values

Describe alternatives you've considered
None

Additional context
Some possibilities of configuration:

• When to increment videos (preanimate/postanimate or while iterating through time)
• Incrementing time on every user call that references it, to avoid infinite loops that assume time progression