Signals factory

[polakowo]

• Create a factory to place entry and exit signals iteratively
• Refactor signal generation functions
• Auto-align DataFrames when broadcasting

[codecov]

Codecov Report

Merging #52 into master will increase coverage by 0.06%.
The diff coverage is 90.09%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   90.56%   90.63%   +0.06%     
==========================================
  Files          41       45       +4     
  Lines        6287     7151     +864     
  Branches     1373     1610     +237     
==========================================
+ Hits         5694     6481     +787     
- Misses        275      299      +24     
- Partials      318      371      +53     

Impacted Files	Coverage Δ
vectorbt/base/array_wrapper.py	88.70% <ø> (ø)
vectorbt/base/column_grouper.py	94.77% <ø> (ø)
vectorbt/defaults.py	100.00% <ø> (ø)
vectorbt/generic/accessors.py	95.83% <ø> (ø)
vectorbt/indicators/__init__.py	100.00% <ø> (ø)
vectorbt/ohlcv/accessors.py	100.00% <ø> (ø)
vectorbt/records/__init__.py	100.00% <ø> (ø)
vectorbt/records/base.py	87.35% <ø> (ø)
vectorbt/returns/accessors.py	92.56% <ø> (ø)
vectorbt/utils/decorators.py	86.56% <ø> (ø)
... and 33 more

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