Changed builtin keywords in the script engine to case sensitive.

Signed-off-by: Haru <haru@dotalux.com>
Changed variables, labels, functions, commands to case sensitive.

Signed-off-by: Haru <haru@dotalux.com>
Changed item Aegis ID and mob Sprite ID lookups to case sensitive.

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