Improve the text box entry keyboard controls

[MyreMylar]

also fix a couple of other minor bugs noticed in testing

[codecov]

Codecov Report

Attention: Patch coverage is 84.23913% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 96.32%. Comparing base (a377016) to head (860bb78).

Files	Patch %	Lines
pygame_gui/elements/ui_text_entry_box.py	82.23%	27 Missing ⚠️
pygame_gui/core/text/text_box_layout_row.py	91.66%	1 Missing ⚠️
pygame_gui/windows/ui_file_dialog.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #528      +/-   ##
==========================================
+ Coverage   95.59%   96.32%   +0.73%     
==========================================
  Files          84       84              
  Lines       11800    11896      +96     
==========================================
+ Hits        11280    11459     +179     
+ Misses        520      437      -83     

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[MyreMylar]

Need to add some tests to this.