Dev Console Update

Add the following functionality to the dev console:
```
remove - Remove one instance of the item with
setflag [true|false] - Set the flag with to true or false (default: true) // Update to set command
setspeed [] - Set the player speed to (Default: default speed)
list [items|flags] - Lists either items or flags
```

Start by locating the dev console command parser and the existing set command. Add the four requested command behaviors, including the set-command update, and verify that item removal, flag values, player speed defaults, and list targets work as described.

Written by the indexing model from the issue text.