Update ita pathhandling to only store ita paths in user directory

• Only store ita_paths (and load on startup)
  • removes problems with multiple matlab versions on one machine or when switching matlab versions
• inform user of the switch and force the to call ita_toolbox_setup through version bump
  • does affect the startup script which can affect the behavior of other toolboxes (only if sth. goes wrong)
• tested on two windows and one macOS machine

applications/HTMLhelp/ita_generate_documentation.m

@@ -87,10 +87,9 @@ toc
 
 %% Build search database for helpdesk
 % switching to basic rendering to fix bug with builddocsearchdb
-webutils.htmlrenderer('basic');
+% webutils.htmlrenderer('basic'); % no longer needed
 % MATLAB requires the html files to be in its search path
-addpath(htmlFolder, docFolder);
-savepath;
+ita_savepath({htmlFolder, docFolder},'append');
 % switching seems to take a while sometimes
 pause(1);
 if nargin == 0
@@ -98,7 +97,7 @@ if nargin == 0
     rehash toolboxcache
 end
 % switch back to standard renderer
-webutils.htmlrenderer('default');
+% webutils.htmlrenderer('default'); % no longer needed
 
 ita_verbose_info('Please restart MATLAB if the MATLAB ITA Toolbox entry does not show in the documentation browser.',0);
 %% Go back to the last working directory