Selected item bugs

[AydinHassan]

Few bugs related to the selected item:

• If you add a non selectable item, then a selectable item after, nothing will be selected
• Same with addItems
• After set items with no selectable items, selectedItem might refer to a non existing item
• If you remove the selected item, selectedItem is not updated and refers to a non existing item.

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #156      +/-   ##
============================================
+ Coverage     97.82%   97.83%   +<.01%     
- Complexity      416      417       +1     
============================================
  Files            25       25              
  Lines          1289     1294       +5     
============================================
+ Hits           1261     1266       +5     
  Misses           28       28

Impacted Files	Coverage Δ	Complexity Δ
src/CliMenu.php	98.38% <100%> (+0.03%)	94 <0> (+1)	⬆️

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[Lynesth]

👍