convert: added documentation for util.dbg
convert: now generates string resources

now using PEFile in new class StringResource
generating file assets/string_resources.docx
util: wrote generalized string tokenizer functions

allow tokenizing strings by a separator, while evaluating escape sequences
such as '\n', '\separator', '\\'.
convert: made tokenizer escape-sequence aware

also, some general cleanup in the auto-generated cpp files,
and auto-generation code.
Merge remote-tracking branch 'origin/master'
convert: fixed clang++ compiler warning

http://llvm.org/bugs/show_bug.cgi?id=19244
convert: pefile.py: replace 'print' by 'dbg' calls
convert: now generates string resource header/cpp
convert: openage now reads string resources file
ci: installing sound libaries: libopusfile, libopus and libogg