Numerapi

- remove deprecated fields (50)
- remove userActivities query (deprecated, use userProfile fields instead)
- remove payments query (deprecated, use userProfile fields instead)
- remove misc deprecated fields from userProfile like badges, earnings
- remove misc deprecated scores from submissions like consistency and concordance
- remove misc deprecated fields from userProfile.dailyUserPerformances like reputation and rolling_score_rep (use corrRep/mmcRep/fncRep instead), and all the early staking 2.0 fields like averageCorrelation, averageCorrelationPayout, sumDeltaCorrelation etc.
- fix 'get_competitions' by removig deprecated fields (49)

- lower pandas requirement to pandas>=1.1.0 to fix problems for users working in google colab (48)

- resumable download (42)
- Upload submission functions using a pandas dataframe (46)

- enable registering submission webhooks and trigger IDs (44)

- make `get_current_round` available in SignalsAPI
- add `download_validation_data` to SignalsAPI, to download the latest validation
data, historical targets and ticker universe

- deprecate multi-tournament handling
- `get_models` now returns the list of models depending on the tournament you
are working on - numerai classic (NumerAPI) vs numerai signals (SignalsAPI).
This is necessary after the recent "model split".