Update the language database from the canonical sources:
- It now includes most locales supported by Windows 10.
- It now also has the following attributes for each entry:
- BCP 47-like locale tag.
- Reference to canonical name for generic language entries.
- Language name in this language itself.
- Also add data file with list of language script identifiers and
aliases based on ISO 15924.
- And update genlang.py to handle all the new attributes and data.
Also move database-related methods of wxLocale to wxUILocale and
just redirect wxLocale methods to the new wxUILocale ones (they are
still preserved for compatibility).
Closes https://github.com/wxWidgets/wxWidgets/pull/2594
To make the code more manageable, intl.h now contains wxLocale and
translation.h all translations-related stuff (wxTranslations, _() etc.).
Code generated by genlang.py was moved into its own files (language.h,
languageinfo.cpp).
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64118 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
