- divide text, append guitar part when instrument is guitar

- also reduce flat keys for guitars and sharp keys for saxophones

- melodies may be not that random when from the list
- and their order can be set

- answers/questions on those instruments were disabled

Fixed translation context to reuse as many "older" texts as possible without disturbing the translator.
Some other minor fixes.

More adjustments of Level creator for instruments different than guitars. Some level definitions adjusted as well. In level preview(s) - use instrument specific glyph instead of guitar one.

Restored charts functionality (partially) - QML Window with painted quick item rendering old chart scene
Moved common q/a texts to TnootkaQML

Renamed methods and enumerator related to fret to name related to instrument. Also changed asNote to onScore

Adjust C-major scale level for bandoneon, default 'master of masters' as well. Hide guitar related controls in level creator.

Use methods to access Tnote properties (note(), octave(), alter()) instead of direct access to corresponding class members

Moved Translations of levels definitions to Tlevel context (from QObject), removed line breaks from some texts (range and accidental settings)

Level creator adjusted to melodies, added rule of level validation (tonic note in range), updated all runtime reactions of level settings.

Tnote::acidental to alter Tnote::getChromaticNoteNr() to chromatic(). Reading level and tuning works

Added simple algorithm to randomize melodies, deploing it in exams (crashing so far), added method to play Tmelody in Tsound and to display it in TmainScore

level creator again excluded - it cases crash inside main, fixing levels back with necessary moves of files

Improved level creator, adjusted to melodies support as well, all built-in levels defs moved to separate file