Function logger

Returns a console logging function which prefixes messages. This is useful for tracing messages from different components. Each prefix is assigned a colour, further helping to distinguish messages.

Use logSet to get a bundled set.

// Initialise once
const log = logger(`a`);
const error = logger(`a`, `error`);
const warn = logger(`a`, `warn);

// And then use
log(`Hello`);    // console.log(`a Hello`);
error(`Uh-oh`);  // console.error(`a Uh-oh`);
warn(`Eek!`);    // console.warn(`a Eeek!`);
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Provide the colourKey parameter to make log messages be coloured the same, even though the prefix is different.

// Both loggers will use the same colour because they
// share the colour key `system`
const log = logger(`a`,`log`,`system`);
const log2 = logger(`b`, `log`, `system`);
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