Version 2.5.0 wip

- Add format Bb Code (h1, h2, h3, h4,, h5, h6, cust1, cust2 & cust3)
- Modify some code in the JS framework (RTE<=>Bb Code editor ; new
parent function to alter a tag before Bb Code conversion, etc.)
- see mods of 2.4.2 version