Revamped config & new bridge gateway to handle

- Existing Subflows (Light, Button & Motion Sensor receivers) are now 'configurable' for easier integration in existing system
   - ID / RID is set in insert node config
- New subflow added 'Light Sender' to send commands to lamps easily, using node config :
   - ID / RID is set in inserted node config
   - type of light (light point or group of light)
- The 'bridge link' (receiver & sender) was revamped:
   - single centralized grouped nodes for all calls
   - handles 'overflows of calls' (i.e. when the HUE bridge refuses calls because it rate is > 5/sec, they are queued for repeat)
   - a return value is sent to allow continuing the flow after command was sent
- removed / merged the 'technical' subflows (only used in configuration part to find the ID's / RID's
- A bit of 'UI'
   - Re-organized nodes in groups to make it easier reading / configuring / accessing
   - Some comments are directly readable without opening them (i.e. double click on it)
   - added output names to subflows to easily know what to expect as output when reading flow using such nodes (without having to open subflow)
   - ...

Author: FredBlo