[Windows] Remove 10.0 version content and make versioning less visible for subsequent releases

[Windows] Refactor WiX installers for Windows, Windows Engine and Developer to remove versioned paths and registry for simplified future upgrades

[linux] Linux buildsys

[Windows] Remove manual edit requirement for keymanversion.* and fixup build dependencies that arise as a result

rename tmpbuild make target to tmpinstall

sudo make install now installs keyman-config as well

so that -h can be run without dependencies installed

more things needed in some README.repo

cow.sh: make it compatible with xenial
  set DIST for use with optional local .pbuilderrc, also in deb.sh
  link linux/.pbuilderrc to ~/.pbuilderrc if it doesn't exist

run the cow hook after deb is copied to location

make deb now builds dist rather than devdist
include README.md in Debian package
improve keyman-config dependencies and keyman package description

avoids calling dpkg-parsechangelog erroneously

don't pass on parameters

to kick off a test jenkins build

add VS code workspace for linux dir
that also includes onboard-keyman dir
fix cow.sh creation of hook scripts

potentially useful for jenkins if it has to make the source
packages individually

also autotools update