This is issue 869 and is required for several reasons: 1) to make Inishell more
similar to MeteoIO, Snowpack, etc 2) because Qt6 is moving to CMake in
replacement of qmake 3) because it will "easily" allow creating native packages
for several platforms.

- Implement issue 826:
  Replicator keys can now be empty in which case they will not be tied
  to any INI structure and can spawn arbitrary INI keys.
- Numbers now do not have to be at the end of a Replicator anymore
  ("FILTER#::ARG" is acceptable now)
- A Replicator can now inject a single number into a key like
  (A#::B# --> A1::B1) if it is not nested
- Merge new debug menu entries from master (better way coming up)
- Heavy maintenance work

This is a squashed commit of 26 commits with the following commit
messages:

Split up some dynamic panels functionality
This is a first step to trying to enhance their logic.

Add test XML for dynamic panels

Try new dynamic panels syntax
At least for developing replicate=true and template=true are dropped in
favor of option nodes like in other panels.
This will make structuring clearer and can be reverted for more
stringency later.

Save possible child panels to container

String operations instead of regex

Multiple # replacements possible

Include Replicators without key to search

Detect if Replicator can replicate Replicators
... and couple this with the start of better (more clear) # --> number
substitutions
(all of these are intermediate commits)

Use info when reps can replicate reps
If not, all occurrences of "#" should be replaced
(moving forward with issue 826)

Propagate replicator child keys to potential template

Try to handle nested Replicators

Back to "replicate=true"
The added verbosity does not seem to bring benefits, and for at least
one thing it's better this way (no cascading into finding the
appropriate key, in a Selector e. g.)

Mini-Cleanup

New lookup logic for Replicators

Support 2 levels of rep/sel nesting

Cleanup
Remove lots of debug code
Add comments

Cleanup, comments

Re-add lost changes

Allow empty Replicator keys
Now if keys are empty use the new, if they are not use the old logic

Handle Replicator help

remove test xml from version control

In debug mode, show how long building XMLs takes

switch to release

Add panel search debug functions
This can be useful to check if unwanted hidden panels are somehow being
created

Add comment

The name was a relict from the very first day of project structuring,
but this name here makes for much much nicer tab-completing to source
file names...

This gets rid of an inconsistency where on macOS CMD+H was
already reserved for hiding the window. It's nicer anyway
and we get rid of an almost empty menu ("window").

We need to be able to set the tab bar everything gets built into... so
first, split up some functionality.

If an unknown section is encountered, check our list of dynamic sections
if it fits and should be created.

Since the tab index will change when removing other tabs, the lambda now
emits the tab name to look for and delete.

This implies having a clear parent Section with a "+", and the
duplicated templates can be removed with a "-".

Revert to idea of using a global container - it would be possible to do
it without and always search on the fly, but readability would suffer...

Now dedicated <section> tags may be flagged as templates, and the
respective tabs will show a custom button to take some action to be
implemented.

Add possibility to show the user guide with a specified tab opened. Use this to link to the Preview section from the preview menu.

The color scheme has been redesigned and now follows Solarized (https://en.wikipedia.org/wiki/Solarized_(color_scheme)). Instead of directly coding colors in the code, they have all received symbolic names and then the names are mapped to a specific color. On the long term, we will be able to offer several color schemes, like Solarized, osX, Windows, etc

Because there was no way to completely reset a Numbers panel (there can't not be a number in a spin box) this is now possible via a generic context menu in all panels. Restructure the menu a little to make these functions more clear

page

Add a menu to show/hide the workflow panel in case it gets lost (it can
always be dragged but with the current icon this is not too obvious)

re-check on onPropertySet when the value does not actually change.

whole sections.

Formerly INI keys were changed live when changing the value through a
panel, eliminating the need to loop through the panels for output.
However, this introduced more and more intermediate loops (like
disabling child panels of Dropdown, Choice, ... that are not shown) and
gave some headaches when working with missing mandatory values and
similar things. Hence, now we keep the original INI values read from
file as they are and and do loop through the elements at the end to get
the user set values.
Also add a few toolbar buttons and minor changes here and there.

The selector panel is started, and to make this work without unwanted
side effects in very special cases we need to allow Qt to resize all
widgets in the scroll area. Manually calling the routines does not work
cleanly. At least, this also gets rid of the need to redraw the
scroll areas. Took a while to pinpoint this...
Additionally, for now the checkboxes can show/hide their silbling groups.