plugins: DemandEnv - fix shape polling

there is no notion of NaN in integers.

Signed-off-by: Tim Blechmann <tim@klingt.org>
plugins: GrainBuf - catch both inf and NaN phase arguments

fixes #352

Signed-off-by: Tim Blechmann <tim@klingt.org>
headers: whitespace cleanup

Signed-off-by: Tim Blechmann <tim@klingt.org>
class library: FreqScope - defer scope cleanup to AppClock

doOnServerQuit is also called internally, which does not need to be from
inside the AppClock.

Signed-off-by: Tim Blechmann <tim@klingt.org>
Help: Clocks - reformulate help files to adapt for qt

Signed-off-by: Tim Blechmann <tim@klingt.org>