Windows compatibility improvements for naviluagen and vimsyntaxgen

- Replaced POSIX directory creation functions with Windows native ones

Signed-off-by: Haru <haru@dotalux.com>
Corrected a Mob ID calculation error in the navi lua generator plugin

- Fixes issue #2 (special thanks to rosfus and ossi0110)

Signed-off-by: Haru <haru@dotalux.com>