Code editor: Add custom command support

[icewolfz]

Add custom action support for rooms/monsters/objects to add code to init()

need name:code similar to custom code blocks

[icewolfz]

Commands are added in the init() block in form of add_action(function, command, flag)
Function is a string or closure, maybe test for (::) and create stubs a needed if not found in the function list
each room/monster/object needs a command[NAME] = {function:value, flag:value}, i may not support the flag argument as that is advanced and 99% of people will never use that argument
maybe if command is a comma delimted list itis converted into array format to allow 1 function multiple commands

[icewolfz]

d3de6a6 adds back end and code generation support for basic command = function name, went simple as 99% of people will just use the simple format, will tie into the function system so you can create functions there and select them for use for commands, if command function is empty or not in the function list it will create a function stub in format of

int cmd_NAME(string args)
{
   return 1;
}