update set_release.cmake for 2020-12-R1

python: upgrade to python3

release: 2018-06-R1

Update version string setting proceedure

Package maintainers can override the git repo detection by providing
their own release version string using cmake -DRELEASE_STRING="you_version"
For all othe

Update version string setting proceedure

Package maintainers can override the git repo detection by providing
their own release version string using cmake -DRELEASE_STRING="you_version"
For all other users we check for a git repo and default to the last release
version string if none is found

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Update release string logic to check for git dir by default

Force PCAP on by default, and remove dependency from cmake

Fixes #34

Could probably use more testing

Tidy up shared/static variables

cmake: find PCAP correctly on both Linux and OS X

cmake: use homebrew version of libpcap by default

Fixes #15

Add forgotten cmake module to git
- This *may* have been part of my testing method

Use cmake modules to alter the git commit hash when rebuilding
- as opposed to re-configuring

Add commandline tools to cleanup

Adding cleanup script to tidy up after previous releases

Add cmake module not provided by crappier distros

Add missing FindPCAP script

Make header location more sensible

Add extra search paths for btbb includes

Build libbtbb and pcaptools using cmake