Support hot-deploy for design-time role definitions

[alexbudarov]

Motivation
Implementing and debugging design-time role definitions is a tedious task.
Like below:

• launch app
• login with test user with assigned role (in development)
• try to reach necessary function
• get "access denied"
• add one more permission
• restart app, wait for server start
  ...
• login with test user
• try to reach necessary function
• get "access denied"
• add one more permission
• restart app, wait for server start
  ...
  It would be a great usability improvement of the development process if changes in design-time role definitions were caught instantly by the application.

What to do

• Add support for hot-deploying role definitions.
• Add new or use existing flag to disable such ability in production environment - as a dangerous behavior for production environment