- most of the things in utils/ are in the CalamaresUtils namespace,
let Permissions follow suit. Chase the name change in the
*preservefiles* module.
- add an `apply()` function for doing the most basic of chmod.
Note that we don't use `QFile::setPermissions()` because the
**values** used are different (0755 for chmod is 0x755 in the
enum value passed to `setPermissions()`).
- Let's just have one header definining export- and visibility-
macros for Calamares. They are still selected based on the
export flags (*_PRO), just defined in one header instead of two.
- more flexible way to keep (all kinds of) files from the host
system, into the target system.
- WIP: substitutions like in shellprocess (@@ROOT@@, @@HOME@@ probably)
- WIP: creating a JSON file from global settings
