Restructure to be compliant with composer

[VangelisP]

This PR is a work/restructure to support issue #361 .

What did change:

• Previous contents (eg. configuration_database) moved to folder resources except from the folder extension
• All contents of folder extension moved to root
• added composer.json. Project name follows the attribute file inside the info.xml.

The way this is currently being reformed is working for us. We did follow the logic of having the project's name based on the short name and not on the extension key (old long name) because we believe it's more consistent and appropriate.

We can alter the name of the folder resources that keeps the other data as well, accordingly.

[bjendres]

Will close this PR and do this at the right time for 1.0, see https://github.com/Project60/org.project60.banking/issues/361#issuecomment-1273137025