new page entrance + new dedicated dir for bridges + some fixe, optimizat...

- All bridge move to dedicated dir.
- New page entrance for list all disponible bridge and provide an direct request with bridge functionnality
- Break bridges dependance to call lib, page entrance do this call on demand (not yet documentation, soon ...)
- Bridge come now with annotation (see directly bridge example for example)
- Some optimizations and fix
- Request can be realized in POST, GET (before only GET) and both
- Due to request change, cache modification to create specific for each demand (test are not full, I think I miss something)

Annotation for bridge : page entrance can list but need some informations, that informations are give by annotation system and depend of this list of parameters :
    @name (required) Human bridge name
    @description (optional) Bridge description
    @useN N is integer between 1 and infinite. One use is need for each rss bridge functionnality
    Exemple 1 : @use1(q="keyword search") In this case bridge can be use with one parameter and page entrance is going to ask for one input with "keyword search" as description
    Exemple 2 : @use2(q="keyword search", other="another parameter")