- 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

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