move some properties to new namespace default tip

add new session flags for properties encryption

add new api for encrypted properties

Added tag v1.2.4 for changeset dcf751b270dd

update version v1.2 v1.2.4

update changelog for v1.2.4 release v1.2

fix incompatibility with libcurl 7.62 v1.2

fixes wrong memset v1.2

fix null pointer dereferenciation v1.2

fixes 'Unkown repository' error message in dav-sync v1.2

(0) -300 -100 -10 tip