Put the Item class in a separate header; give it functionality
to create itself from Variants (e.g. from the configuration data)
and to run itself (do whatever the item is supposed to do).
This makes the polymorphic approach unnecessary: we just have
items that are sufficiently smart.
This moves do-a-thing to the Item, while the Job now has one
job: be a loop around creating Items and running items.
- point to main Calamares site in the 'part of' headers instead
of to github (this is the "this file is part of Calamares"
opening line for most files).
- remove boilerplate from all source files, CMake modules and completions,
this is the 3-paragraph summary of the GPL-3.0-or-later, which has
a meaning entirely covered by the SPDX tag.
- 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
