add init gamecontroller flag, now reads mapping from env
add init gamecontroller flag, now reads mapping from env

Signed-off-by: hondres <c36a858d8f526314d13fdb9002609c288f40e4a6@users.noreply.github.com>

KoKuToru/koku-xinput-wine,ProfessorKaos64/koku-xinput-wine,ProfessorKaos64/koku-xinput-wine,KoKuToru/koku-xinput-wine