This patch add's a new cmakefile which builds other cmakefiles and
simplifies the Makefile, also it renames the yang files so
sysrepoctl does not create duplicates.

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Patch includes updates to packages:
netopeer2: update to version 0.4.0
sysrepo: update to 0.7.0
libnetconf2: update to 0.9.15
libyang: update to 0.13.46

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>