* cleaned up code and improved coding style
* removed old SINGLE_SOURCE_COMPILE macro relicts
* use QString::toUtf8() instead of QString::toAscii() wherever possible
Added generic drag'n'drop support for all instrument views. All
resources supported by the according instrument now can be dropped
onto instrument view without any extra code in actual instrument.
Additionally renamed some files and classes related to InstrumentView
class to match new style.
Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>
