Add console support for extensions

[LeNitrous]

Prerequisites: https://github.com/vignetteapp/vignette/pull/264

Adds the following methods to the extension's global scope:

• console.log
• console.warn
• console.error
• console.debug
• console.time
• console.timeLog
• console.timeEnd
• console.count
• console.countReset

All methods behave similarly to its NodeJS and Browser counterparts.

[sr229]

Internally in Node.js they use stdout, how did you approach this one?

[LeNitrous]

We make use of Stride's logging system. Listeners can subscribe to outputs. Listeners can be a console or something that writes to a text file.