Implement commands to be executed

[contractpendev]

Commands to be executed from the work server to a client worker are as follows.

template template

1. deploy guid, dir
2. export dir, to json file
3. exportmulti dir, to json file
4. execute dir
5. upload path, file contents (saves file to disk)
6. download path (downloads file from disk)

For each command the following must be implemented

a. Command can be sent to the server
b. Command can be sent from the server to a subscribed worker denoted by an id
c. A subscribed client which is not working at this moment is sent a worker job due to it not being busy
d. When a client finished working it sends to response back to the server
e. Server can be instructed to execute a command from REST API
f. Result of a command is stored on server
g. Result of command can be queried