Replaces the list of points in TempoMap with TempoSection functions, which
compute tempo-at or tick-at time relative to tempo section start.
TempoMap consults them additively to determine things like bbt_time(),
frame_time() get_grid() etc.
This has a marked effect on scrolling speed along with the code simplification
in the places it has been attempted.
Several things are broken here.
Currently every ramp except the last one is an exponential ramp. this may
be simple to fix :).
Mouse-over midi grid doesn't match mouse click grid. should also be simple.
Many things seem to work, but their accuracy should be in question until
each area has been addressed.
uselib is no longer implicit (inherited by .use). This is still incomplete,
some uselibs for non-linux variants may be missing.
bld.is_defined("HAVE_XXX") also no longer works and will have to be
changed (I think to bld.env["HAVE_XXX"]) in countless places.
This avoids "[ERROR]: JACK: jack_port_set_name: deprecated".
if libjack does not have jack_port_rename(), weak_libjack.def provides
a fallback using jack_port_set_name().
jack/systemdeps.h is jack2-only and contains many
windows-specific typedefs (native windows threads, ptw32 threads, MSVC
special cases etc etc.) which are not present in jack1/shared headers.
Those objects do not have a versioned API by themselves.
This fixes issues with duplicate deployment (OSX, Linux bundles: cp) and
ardour listing control-surfaces multiple times (file index plugin dir).
at the time the graph gets around to takes down
client threads, the jack-backend’s jack_client has been reset.
But never mind: libjack does not care about it, anyway.
This is backwards compatible, quotes are only added if needed.
JACK1 < 0.123.1-30 and JACK2 < 1.9.10-25 fail with either
whitespace or quotes, so nothing is lost.
