Filter restricted modes

See merge request !6

Return filtered list of modes from availableModes. Handle available
modes signal so that it uses filtered list.
Signed-off-by: Tomi Leppänen <tomi.leppanen@jolla.com>

Expose usb moded target state as property

See merge request !5

There are "modes" that signify actual mode changes and then there
are "modes" that signify transient events such as connect/disconnect.
The former ought to be called "states" and latter "events, but the
header uses moniker "state" for "events."

Explicitly mention "state" or "event" as appropriate.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Usb-moded now provides information about target state of ongoing mode
transitions. Expose it as Qt / QML property.

Also utilize separate state change and event D-Bus signals provided by
usb-moded to avoid need of heuristics for telling apart mode names from
event names.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Handle usb mode changes separately from events

See merge request !4

Usb-moded sends both events and mode change indications via the same
D-Bus signal. Updating the cached usb-mode based on events means the
value is not necessarily in sync with what a direct query would return.

Update usb-mode only on mode changes and forward events as QT signals.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Some usb-modes / events do not have qt/qml compatible symbolic names and it
is not possible to tell apart mode change notifications from usb events that
do not affect current mode.

Add qt/qml constants for all built-in usb modes / events known to usb-moded.

Add methods that can be used for telling apart events from mode changes etc.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

The set_mode() method call merely initiates mode transition, and a separate
signal will be broadcast when/if it finishes.

Ignore set_mode() reply value, but leave the pending call handler in place
as it still has use from debugging point of view.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

[usb-moded-qt5] Properly link package and .pc version. Contributes to JB#38551

See merge request !3

[usb] Add api for the available modes property. Contributes to JB#33745

See merge request !2

[usb-moded-qt5] Expose hidden modes list. Contributes to JB#34611



See merge request !1

Move constants from QUsbModed to base class QUsbMode

QUsbMode can be used for the purposes of exporting USB mode constants to QML.
Unlike QUsbModed, its instantiation doesn't involve any D-Bus action.