Send keys to widgets first

[willmcgugan]

Send key events to widgets first

Addresses #64

[codecov-commenter]

Codecov Report

Merging #67 (de4bfb7) into main (564a408) will decrease coverage by 0.06%.
The diff coverage is 2.47%.

@@           Coverage Diff            @@
##            main     #67      +/-   ##
========================================
- Coverage   4.30%   4.24%   -0.07%     
========================================
  Files         51      52       +1     
  Lines       3808    3865      +57     
========================================
  Hits         164     164              
- Misses      3644    3701      +57     

Flag	Coverage Δ
unittests	4.24% <2.47%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/textual/_callback.py	0.00% <0.00%> (ø)
src/textual/_linux_driver.py	0.00% <0.00%> (ø)
src/textual/app.py	0.00% <0.00%> (ø)
src/textual/events.py	0.00% <0.00%> (ø)
src/textual/layout.py	0.00% <0.00%> (ø)
src/textual/message.py	0.00% <0.00%> (ø)
src/textual/message_pump.py	0.00% <0.00%> (ø)
src/textual/reactive.py	0.00% <0.00%> (ø)
src/textual/view.py	0.00% <0.00%> (ø)
src/textual/widget.py	0.00% <0.00%> (ø)
... and 5 more

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