v4.7 - Simulation browser overhaul, part 2

Added

• gui/browser: private workspace for each user account
• gui/browser: move simulations, genomes or folders to other workspace (via toolbar buttons)
• gui/browser: edit simulations, genomes or folders (via toolbar buttons)
• gui/browser: expand and collapse folder content (via toolbar buttons)
• gui/browser: cache for speeding up downloading simulations
• gui/upload dialog: validation of user input to allowed characters
• gui/upload dialog: upload simulation or genome to folder
• gui/simulation parameters, model: individual cell color mutation

Changed

• gui/browser: layout (in particular, new widget for selecting workspace)
• model: restrict the fusion of energy particles to certain energies