Add kafra support

[nmeylan]

In order to add kafra script work, following native function should be implemented:

• cutin
• percentheal
• viewpoint
• implode
• countitem
• delitem
• basicskillcheck
• getskilllv
• getcharid
• getguildinfo
• savepoint
• emotion
• logmes

[danielhe4rt]

Hey! I dig in into the scripting system and so far that's what I understood:

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if you want to contribute with the npc scripting, follow the instructions below

• add the new function into ./native_functions_list.txt and make sure about the return type setted
• create your test npc call at config/npc/pre-re/custom/test.txt with the new function to be coded
• add the new function at server/src/server/script/mod.rs under the NativeMethodHandler (line 180~)
• IF there's any constant defined on the rAthena e/or Hercules scripting, add it on server/src/server/script/constant.rs

The goal is to make scripting compatible with rAthena and Hercules, so use their source and study how they implemented the function.

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That's correct or I'm missing something?

[nmeylan]

yes that is it.
We need to implement missing function as they are described in doc https://github.com/rathena/rathena/blob/master/doc/script_commands.txt