Enable Surface, show GUI, disable surface. repeat.
Previously this cased a crash in glibmm:
The type name `glibmm__CustomBoxed_N13ArdourSurface6NS_UF86Button2IDE'
has been registered already.
* Use dedicated port-names for UFx
* Do not show SSL-UFx device-info files in MCU
* Fix Window namespacing/missing symbols
* Address Windows ambiguous symbols (Button, Surface)
Those used to have a Mackie:: prefix, now they need
MACKIE_NAMESPACE
When re-opening the GUI, there is still a somewha mysterious warning:
```
glibmm-WARNING **: file value_custom.cc: (Glib::custom_boxed_type_register): The type name `glibmm__CustomBoxed_N13ArdourSurface6NS_UF86Button2IDE' has been registered already.
```
This fixes several callsites that were passing samplepos_t to get a TempoMetric,
some of them somewhat significant (e.g. VST plugins that want tempo information).
Bad API design on my part, apologies.
This commit combines libs/ and gtk2_ardour because the new private status
of the ::metric_at() call would be a blocking point for git bisect
* reserve "probe" to actually probe for devices
* use separate probe for libusb and MIDI port devices
* use "available" to check if surface can be used
* allow both methods to be NULL
* remove unused ControlProtocolDescriptor* argument
Most surface just return `true` for available.
This is better provided by Plugin::print_parameter, which
is called by PluginControl::get_user_string(). This removes
special cases for the mode enums.
This is mostly a simple lexical search+replace but the absence of operator< for
std::weak_ptr<T> leads to some complications, particularly with Evoral::Sequence
and ExportPortChannel.
