* Mixpanel initiation
* copied schemas and specs file from singer connector
* authentication and a few streams
* Added Funnels + FunnelsList
* Added example of funnel response
* added incremental Funnels stream with tests
* added Annotations, CohortMembers, Engage, Cohorts, Funnels
* added Revenue
* fixed formatting
* fixed variable names
* fixed cohort_members and updated export streams
* moved start_date and date checks into SourceMixpanel class
* added error handling
* added unit test, update docs and ci creds
* fix url base for export stream
* added full and incremental read for export stream
* updated acceptance tests, added limit correction based on number of streams, export cursor is stored in datatime string
* Funnel stream - added complex state which contains state for each funnel
* added attribution windows support and project timezone config
* fixed formatting
* added default timezone
* added dynamic schema generation for Engage and Export streams
* fixed formatting
* fixed ability to pass start_date in datetime format as well
* fixed ability to pass start_date in datetime format as well
* added additional_properties field for dynamic schemas. updates regex for start_date matching to support old config file
* fixed formatting
* export stream - convert all values to default type - string
* added schema ref
* added new properties for funnel stream
* fixed formatting in funnel schema
* added build related files
* update changelog
* fixed and added comments, renamed rate_limit variable
* fixed formatting
* changed normalization for reserved mixpanel attributes like $browser
* alphabetise spec fields
* added description about API limit handling
* updated comment
