add click() to baseWrapper

[cmhulbert]

UIAwrapper claims to have click() functionality, but it only has
click_input functionality. This adds click functionality similar to that
in uia_controls, by using Invoke pattern.

[codecov]

Codecov Report

Merging #601 into master will decrease coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #601      +/-   ##
==========================================
- Coverage   95.69%   95.62%   -0.08%     
==========================================
  Files          49       49              
  Lines       20157    20160       +3     
==========================================
- Hits        19290    19278      -12     
- Misses        867      882      +15

[vasily-v-ryabov]

Thanks for contribution. But this is not the right place for click() method. BaseWrapper is a base class for both backends including "win32". And it's kind of abstract class.

More proper place is UIAWrapper where you can add alias click = invoke and remove it from uia_controls.ButtonWrapper.

The initial idea for this alias for ButtonWrapper only is that InvokePattern may have different meaning. But it seems many buttons have custom control type, but implemnt InvokePattern anyway.

So I agree to move it from ButtonWrapper to UIAWrapper. Just make it properly please.