Add a hot reload

[nawarian]

Currently the development cycle requires a save, kill, start process.

A hot-reload wold be very handy.

[nawarian]

An option can be the Soft Mocks package. It allows to redefine functions and methods.
The way I see it, it would be required to do something like this:

• Listen to file changes (can be on the game loop)
• On file changed, parse using PHP Parser
• Fetch all methods in it
• Fetch the body of each method and pretty print it as a string
• Call the redefineMethod() function

This seems a bit hairy though.