also cleanup old unused versions

- Upgrade PHP to version 7.3 and add more  required extensions
- Use mariadb from stack/erp5 because we won't code again all feature done there for mariadb, initialization and backup to have it up-to-date.
- Delete old files which are not used anymore
- Remove integrated resilience scripts, resilience will works with webrunner which is more stable today.
- Add Nextcloud software release with some script for auto configuration.

/reviewed-on nexedi/slapos!602

   It prevents things skip offline control.

This repository for holding the BT which not suitable to put
in erp5 main repository

Include *.data and *.wasm files.
Which the content type is "application/wasm"

Stack LAMP was not used for years so it was completely outdated was not working anymore.
The stack was rewritten to make it works with php7.3
Use mariadb from stack/erp5 because we won't code again all feature done there for mariadb, initialization and backup to have it up-to-date.
Delete old files which are not used anymore
Remove integrated resilience scripts, resilience will works with webrunner which is more stable today.

Build pyodide on SlapOS
Add test for pyodide compiling

f2c is a compiler which compile Fortran code to C code

Auto-compute a value suitable for the number of requested Zope processes
and threads for default ERP5 needs.

For future patches readability.

Notice that project changed from github.com/mholt to github.com/caddyserver