New routes are placed after highest selected route.
Fix midi-note length when quantizing a swing rhythm

Note: 'swing' probably requires a 2nd iteration:
first quantize notes to the grid, then apply beat shift.
make fixed IO ports untranslatable

Outdated and fuzzy translations of MTC, MTC, LTC, etc caused
various issues (duplicate jack port names, exceptions, crashes).
Functionality should not be affected by translations (for now).
remove fuzzy and obsolete translations
add script to clean up translations
Don't fail jackd command line creation for jack dummy backend.

The dummy jackd backend doesn't require a device to be specified, so much
of the error checking in get_jack_command_line_string() is irrelevant, if
not actively wrong, when the dummy backend is specified.

Only perform the checks if the chosen jack backend is not the dummy.
Fix setting playback & capture channel counts for jackd dummy backend.

Unlike all the other jack backends which allow setting the number of inputs and
outputs with -i & -o, the dummy backend uses -P & -C for this. Make the jackd
command line use these options when the dummy backend is requested with a
specified input or output channel count.
Don't ever pass -d for device name to dummy jackd driver
Report an error to stderr if creation of jack command line fails.

Output a simple message to stderr if get_jack_command_line_string() still
fails for any reason.
fix MMC

MTC and MIDI Clock port input handling was moved into the process/RT thread(s) during audioengine work, but MMC was
left orphaned. Add it to the port(s) handled by the MIDI UI thread.

Also, remove PortChange request from MidiUI because it has no meaning anymore
Use add_route_dialog's transient_for() window to determine track selection for order_hint.
Merge branch 'ordering_fixup' of https://github.com/nmains/ardour
Add a double-click handler for items in the editor window.
Make double-click on marker pop up rename dialogue.
Mark session dirty when a marker is renamed.
Double-click on region pops up region properties.
Edit tempo & meter markers on double-click.
Don't allow loop, punch, or session range markers to be renamed.

Don't allow loop, punch, or session range markers to be renamed, even when
double-clicked.
Fix french translation of "meterbridge" -- closes #5744
remove c99'ness from rsynth.c - should fix #5751