Release 2.7.6

• Minor bugfixes and improvements
• Improve e-mail scheme security model by adding a mutex lock when generating codes, and adding a code prefix sent in the trigger method to mitigate stolen codes
• Update cmake script for a cleaner build
• Add config values user_backend_api_run_enabled, user_middleware_backend_api_run_enabled, client_backend_api_run_enabled, scheme_api_run_enabled to list authorized backend or schemes for a Glewlwyd instance
• Add config value originating_ip_header to specify the header value containg the originating IP address, if any
• Add config values response_body_limit and max_header to limit download sizes when relevant
• Rework Docker files to build from source instead of downloading packages from github
• cmake: split package build options in 3 (tar.gz, deb and rpm), and set all packages build to off by default
• Security: Fix possible buffer overflow in webauthn attestation