New command structure alpha

Rename test Helpers class to TestHelpers.

Fix missing namespace use.

Set default log verbosity on object creation to prevent potentially overwriting the value when calling setLogRequests().

Fix getUpdate handler to incorporate new Update processing.
execute() method for ALL commands must now return a ServerResponse object, not a bool!!
handle() now returns a bool, handleGetUpdates() still returns a ServerResponse object.

Remove $command from commands, not needed.
Minor docblock corrections.

Rewrite custom JSON input for debugging. Remove custom JSON input in handle() method.
Fix issue that disabled or invalid commands died silently. Always output some "Command not found" message.

Correct and complete a few docblocks.

Fix some documentation and error outputs.

fix use command

Move start command to the system commands.

Commands are split up into 3 categories: System, Admin and User.
They can be overridden individually by custom command directories.
STILL ALPHA STAGE!