Add a TimeField class to Pyface

[corranwebster]

This adds a time editing field to the pyface.fields API. This is a simple field with no bounds checking (Qt supports this Wx doesn't without significant additional work).

The ulterior motive for this is to see if this can be the basis for the TraitsUI TimeEditor, allowing us to move all the toolkit-specific code down to Pyface. In the meantime, this will allow adding time editors to toolbars.

[codecov-commenter]

Codecov Report

Merging #507 into master will increase coverage by 0.92%.
The diff coverage is 93.87%.

@@            Coverage Diff             @@
##           master     #507      +/-   ##
==========================================
+ Coverage   39.76%   40.68%   +0.92%     
==========================================
  Files         493      507      +14     
  Lines       27259    27695     +436     
  Branches     4140     4192      +52     
==========================================
+ Hits        10840    11269     +429     
- Misses      15944    15952       +8     
+ Partials      475      474       -1     

Impacted Files	Coverage Δ
pyface/ui/qt4/data_view/data_view_item_model.py	49.30% <38.46%> (-0.70%)	⬇️
pyface/fields/i_time_field.py	85.71% <85.71%> (ø)
pyface/ui/wx/data_view/data_wrapper.py	86.36% <86.36%> (ø)
pyface/data_view/i_data_wrapper.py	88.46% <88.46%> (ø)
...face/data_view/data_models/row_table_data_model.py	91.25% <91.25%> (ø)
pyface/ui_traits.py	86.11% <93.93%> (+2.32%)	⬆️
pyface/data_view/value_types/color_value.py	95.45% <95.45%> (ø)
pyface/color.py	100.00% <100.00%> (ø)
pyface/data_view/abstract_value_type.py	97.72% <100.00%> (+0.29%)	⬆️
pyface/data_view/data_models/data_accessors.py	100.00% <100.00%> (ø)
... and 34 more

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[rahulporuri]

LGTM with a bunch of mostly nitpicky comments.