[buildqtc] rename option extra to revextra

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[scripts] add more options to master script

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[scripts] renamed master build script

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[scripts] better option handling for master build script

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>