Log Message:
qsynth: Update to 0.6.2

0.6.2  2020-03-24  A Spring'20 Release.

- A scalable (.svg) icon version has been added.

- Make man page compression reproducible (after request
  by Jelle van der Waa, while on the Vee-Ones, thanks).

- Ditching deprecated QTime methods for QElapsedTimer's
  (in compliance to Qt >= 5.14.0).

- Bumped copyright headers into the New Year (2020).