More dynamic ParamPanel and more widgets

[philippjfr]

• Adds discrete slider

• Adds autocomplete widget

• Link parameter attributes (bounds, constant, objects) to widgets

• Fix datetime and range widgets

• Add support for displaying subobjects

• Unit tests

• Update docs

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0d70388). Click here to learn what that means.
The diff coverage is 97.57%.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
=========================================
  Coverage          ?   84.72%           
=========================================
  Files             ?       15           
  Lines             ?     1814           
  Branches          ?        0           
=========================================
  Hits              ?     1537           
  Misses            ?      277           
  Partials          ?        0

Impacted Files	Coverage Δ
setup.py	0% <ø> (ø)
panel/panels.py	40.7% <0%> (ø)
panel/tests/test_layout.py	100% <100%> (ø)
panel/tests/test_param.py	100% <100%> (ø)
panel/util.py	51.4% <100%> (ø)
panel/tests/test_widgets.py	100% <100%> (ø)
panel/viewable.py	81.66% <85%> (ø)
panel/layout.py	95.37% <92.18%> (ø)
panel/widgets.py	97.32% <92.85%> (ø)
panel/param.py	90.85% <96.7%> (ø)

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