- just to be similar to GLOB and SOUND objects

- all GUI scaling depends on it
- properly obtain pixel size by point size and DPI
- so reviewed all occurrences
- changed global fontSize() to factor()

- this way fix opening external exam file

- call close() of drawer from button click method (this is common entry
for all button instances)
- add scale animation when clicked
- disable label click when exam

- small icons adjustments
- move 'pitch detection' action routines to C++

So changed controls layout to nicely fit mobile screens
Tsound is event handler to detect volume keys (only Android)
Tuner dialog example frequencies uses styled note name now

[Charts] Added handy drawer with exam list and chart options, so unloaded analyze window tool bar, removed bar, line chart icons. Revert displaying warning about unable to load exam file. Avoid crashes when current exam model has no delegates.

Initialize font pixel size of overriden controls to respect global, user set font size. Adjust code to it when necessary

Score: Added shortcuts for rise/lower accidental, lock score menu items when score is read only, moved 'notes' action for additional rhythm/alters menu to TmainScoreObject, so keep this menu entry always in proper place in the 'score actions' model
MenuButton reacts when its action is disabled (colors)
Executor: Fixed displaying result tip in exercises,
Authors: finally use model for all translators,
Revert key signature status, reuse accids and mouse area components - reduced code

Revert time status message functionality. TnootkaQML is a node, showTimeMessage emits statusTip signal to QML and message is propagated. Background color change also is supported. Such kind of messages are shown even despite of hints age disabled by user.

Change exam playing icon when playing, fixed returning playing state method. Enlarge tool bar icons when hovered, other scaling animations of available QML buttons. Minor fixes.

Bug fix: do not play pitch detected note (score object did that), new progress bar of exam results, ignore technical symbols according to instrument type, make confirm tip able to close - it may cover note name. other minor fixes

Added 'edit mode' to score, if not set, clicking a note just selects it, also hiding controls and cursors then.

Added actions for rhythm change in the score. Added sub-menu with them to score menu. Create all actions and their shortcuts on C++ side.

Improve menu with recently used exams, limit the list to 15 exam files, wrap menu list with scroll if needed. If menu entry (MenuButton) has no icon or check box, use this space for text, so make 'checkable' parameter notify-able in Taction

In start exam dialog: list all previous exams properly when the exam list is long and requires scrolling.
Added new donor name, app image fixes

Added status tip popup over tool bar, displayed when only needed. TnootkaQML handles all through setStatusTip() method (available from QML) and emits statusTip() signal handled by StatusTip.qml component. So added a few status texts.

Create score menu on demand only, so exclude it to separate file, use TipRect as a background item (also for TempoMenu).

Adjust to Qt 5.10 changes (buttons have action and icon props so rename custom props to taction and pixmap apparently)

Using global function to obtain font size instead of property of main window. There are over 250 signal/slot connections less. Launch time seems to remain the same

Menu button displays shortcut (desktop) if defined and check box if its action is checkable. Taction adjusted to that.

Do not load toolbar on desktop, create drawer under mobile. Both are using common actions defined in main window