[Scripting] Documentation update

[krkruk]

LV3 application should provide script registering functionalities:

• Store on the fly commands entered via IO devices such as joysticks
• Establish a set of commands that can be registered.
• Dump a file that stores all the data (can be text or binary one)

LV2 application should run scripts sent from LV3:

• Receive and dispatch the script
• Push the commands to an engine that runs these commands in domain of time

Note that, the functionalities described above should support multiple commands executed in parallel. A chosen data format must support it.