Function logSet

logSet(
    prefix: string,
    verbose?: boolean,
    colourKey?: string,
): { error: MessageLogger; log: MessageLogger; warn: MessageLogger }
Returns a bundled collection of loggers
```
const con = logSet(`a`);
con.log(`Hello`);  // console.log(`a Hello`);
con.warn(`Uh-oh`); // console.warn(`a Uh-oh`);
con.error(`Eek!`); // console.error(`a Eek!`);
```
By default each prefix is assigned a colour. To use another logic, provide the colourKey parameter.
```
// Both set of loggers will use same colour
const con = logSet(`a`, true, `system`);
const con2 = logSet(`b`, true, `system`);
```
Parameters
- prefix: string
  Prefix for log messages
- verbose: boolean = true
  True by default. If false, log() messages are a no-op
- OptionalcolourKey: string
  If specified, log messages will be coloured by this key instead of prefix (default)
Returns { error: MessageLogger; log: MessageLogger; warn: MessageLogger }