net/nanocoap: add inline function for Content-Format
net/nanocoap: add inline function for Content-Format

miri64/RIOT,aeneby/RIOT,cladmi/RIOT,toonst/RIOT,basilfx/RIOT,yogo1212/RIOT,jasonatran/RIOT,kYc0o/RIOT,josephnoir/RIOT,ant9000/RIOT,mfrey/RIOT,authmillenon/RIOT,mfrey/RIOT,OlegHahm/RIOT,mfrey/RIOT,cladmi/RIOT,miri64/RIOT,lazytech-org/RIOT,rfuentess/RIOT,mtausig/RIOT,mfrey/RIOT,cladmi/RIOT,ant9000/RIOT,toonst/RIOT,kaspar030/RIOT,OTAkeys/RIOT,basilfx/RIOT,OTAkeys/RIOT,cladmi/RIOT,rfuentess/RIOT,kYc0o/RIOT,josephnoir/RIOT,josephnoir/RIOT,smlng/RIOT,josephnoir/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,rfuentess/RIOT,x3ro/RIOT,rfuentess/RIOT,lazytech-org/RIOT,kYc0o/RIOT,A-Paul/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,miri64/RIOT,mtausig/RIOT,ant9000/RIOT,miri64/RIOT,basilfx/RIOT,jasonatran/RIOT,x3ro/RIOT,kaspar030/RIOT,authmillenon/RIOT,OlegHahm/RIOT,jasonatran/RIOT,kYc0o/RIOT,aeneby/RIOT,A-Paul/RIOT,authmillenon/RIOT,toonst/RIOT,x3ro/RIOT,toonst/RIOT,rfuentess/RIOT,mtausig/RIOT,smlng/RIOT,yogo1212/RIOT,smlng/RIOT,authmillenon/RIOT,aeneby/RIOT,RIOT-OS/RIOT,basilfx/RIOT,OTAkeys/RIOT,yogo1212/RIOT,OTAkeys/RIOT,mfrey/RIOT,OlegHahm/RIOT,kaspar030/RIOT,OlegHahm/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,cladmi/RIOT,kaspar030/RIOT,mtausig/RIOT,mtausig/RIOT,ant9000/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,x3ro/RIOT,josephnoir/RIOT,miri64/RIOT,aeneby/RIOT,ant9000/RIOT,yogo1212/RIOT,authmillenon/RIOT,jasonatran/RIOT,toonst/RIOT,jasonatran/RIOT,x3ro/RIOT,smlng/RIOT,yogo1212/RIOT,A-Paul/RIOT,aeneby/RIOT,basilfx/RIOT,A-Paul/RIOT,authmillenon/RIOT,kaspar030/RIOT,A-Paul/RIOT,smlng/RIOT