ThreadSearch : documentation + others

[LETARTARE]

Cb-13662 + wx-328 + gcc-14.2, Win-7

I wanted to create the documentation with 'Doxygen' and I had to correct forgetfulness in the comments,
so I made the following changes :
1- omission for comments 'Doxygen' ...
2- all single words 'NULL' => 'nullptr'
3- in manisfest.xml: version '1.14' => 1.15'
4- 'END_EVENT_TABLE();' => 'END_EVENT_TABLE()'
5- event 'EVT_TEXT' not used in ''ThreadSearch.cpp' : see
     

'void ThreadSearch::OnCboSearchExprEnter(wxCommandEvent &event)'

6- in 'ThreadSearch::OnAttach()' with LOGGING string translation

So I dropped a ticket to https://sourceforge.net/p/codeblocks/tickets/1532/

[LETARTARE]

Thank you for the correction in 'r-13665'.