Activity time bounds introduced

New features:

• Add start and stop times for the webcam to avoid shooting at night
• Add an option not to start the hotspot when the wifi is not reachable, to prevent it from turning on once in stable operation
• Normalize server folder structure for FTP and HTTP upload protocols: now both can be used with the same server setup if both accesses to the same folder is available
• Introduce simplified scheduling for the shoots
• Simplify input of the picture resolution
• Add enhanced visual color selector
• Add toggle for FTP TLS to support insecure servers
• Add subfolder support for FTP servers
• Fix bugs and various enhancements to the setup server and remote configuration interface