Bta-lib

- Indicators:
- `ad`, `add`, `adosc`, `adx`, `adxr`, `apo`, `aroon`, `aroonosc`, `beta`,
`ceil`, `cmo`, `di`, `div`, `dm`, `dx`, `ewma`, `exp`, `floor`, `ln`,
`log10`, `maxindex`, `minindex`, `minmaxindex`, `minus_di`, `minus_dm`,
`mult`, `natr`, `plus_di`, `plus_dm`, `ppo`, `obv`, `ppofast`, `roc`,
`rocp`, `rocr`, `rocr100`, `smacc`, `sqrt`, `sub`, `trima`, `var`,
`var_s`

- Improved autosuper to call all leftmost bases up to Indicator and _talib
compatibility methods
- Support of new testcase definition features and refactoring of testcase
definitions, detection of empty tests sets and improved logging for string
defined tests, also refactoring their pseudo-execution position
- Refactoring of _last:_seed, _seed:_seeded and added early (period reducing)
seed calculations for ta-lib compatibility
- Add enum SEED_xxx for seed determination
- Refactor ema, smma, kama for _last:_seed changes
- Refactor obv to use minperiod "macros"
- Util Macro-Style Functions to get/set periods/indices for ta-lib
compatibility

- Indicators:
- `avgprice`, `cci`, `kama`, `medprice`, `mfi`, `stochf`, `stochrsi`,
`truelow`, `truehigh`, `typprice`, `ultimateoscillator`, `wclprice`,
`williamsr`

- Changes and improvements to the testing framework
- Internal API changes to streamline indicator development syntax
- Added custom `_ewm` to use and seed directly instead in the indicators
- Added support for dynamic alphas in `_ewm`
- Rewrite of `ewm` based indicators to `_ewm` for simplification

- First initial public release
- Indicators:
- `bbands`, `dema`, `ema`, `gdema`, `midpoint`, `midprice`, `sma`, `smma`,
`t3`, `tema`, `macd`, `stochastic`, `rsi`, `trix`, `atr`, `truerange`,
`stddev`, `stddev_s`, `acos`, `asin`, `atan`, `cos`, `cosh`, `sin`, `sinh`,
`tan`, `tanh`, `max`, `min`, `sum`, `crossdown`, `crossover`, `crossup`
- Utility and Informational methods
- `ta-lib` compatibility flag/global setting
- Testing framework in place
- Documentation, except for indicator development