Use standard library style members of wxArrayString (and wxString) ...

... which will make it easier to change the types of those containers to
std::vectors of other string-like classes

for wxString,

IsEmpty => empty
Clear => clear
Alloc => reserve

for wxArrayString,

Count => size
GetCount => size
IsEmpty => empty
Add => push_back
Clear => clear
Empty => clear
Sort => std::sort (only with default comparator)
SetCount => resize
Last => back
Item => operator []
Alloc => reserve

src/PlatformCompatibility.cpp

@@ -51,7 +51,7 @@ wxString PlatformCompatibility::ConvertSlashInFileName(const wxString& filePath)
    wxString filename;
    wxString newPath = filePath;
    // int pathLen = 1;
-   while (!wxDirExists(wxPathOnly(newPath)) && ! path.IsEmpty()) {
+   while (!wxDirExists(wxPathOnly(newPath)) && ! path.empty()) {
       path = newPath.BeforeLast('/');
       filename = newPath.AfterLast('/');
       newPath = path;