Alphabetize Library Table returns

KiCad is case sensitive but we need to be consistent in displaying sort
order as case insensitive (same as file systems)

Fixes: lp:1836911
* https://bugs.launchpad.net/kicad/+bug/1836911

(cherry picked from commit ebba15fe67)

common/lib_table_base.cpp

@@ -398,6 +398,12 @@ std::vector<wxString> LIB_TABLE::GetLogicalLibs()
         ret.push_back( *it );
     }
 
+    // We want to allow case-sensitive duplicates but sort by case-insensitive ordering
+    std::sort( ret.begin(), ret.end(), []( const wxString& lhs, const wxString& rhs )
+    {
+        return lhs.CmpNoCase( rhs ) < 0;
+    } );
+
     return ret;
 }