- Removed zombie dependancy on clang since system clang now works
- Now uses python3 by default remove python2 dependancy
- split the VOLK project into separate port
Change log from upstream follows
## [3.8.1.0-rc1] - 2020-02-16
### Changed
#### Project Scope
- clang-tidy improvements
- Throw exceptions by value, catch by reference
- `emplace_back` where applicable
- `empty()` instead of `vector::size() == 0`
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Update to 3.8 git version to move from Qt4 to Qt5
## unreleased
### Fixed
#### Project Scope
- `boost::posix_time::[milli]second` takes integer numbers, and we now at least
cast the floats to integers, as Boost 1.67 forced us to realize we're
(incorrectly) using floating point her
- CMake: using regex to match compiler against "Clang" now enables correct build
on OS X
#### GRC
- Fixed GRC bug which broke WX and Qt (by altering the template code), in
multiple (less than awesome) steps
#### gr-analog
- `fmdet_cf`'s derivative coefficients were wrong.
#### gr-blocks
- `float_array_to_int`: int32 limits were wrongly hardcoded.
- Fixed the undefined behaviour happening in `float_to_complex` when accessing
the second input_items element in the single-input case
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