Create 1.3 branch.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5084 3789f03b-4d11-0410-bbf8-ca57d06f2519
Bump development version now that 1.3 has been branched off.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5085 3789f03b-4d11-0410-bbf8-ca57d06f2519
Bump version to 1.2.90 (1.3beta1).


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5086 3789f03b-4d11-0410-bbf8-ca57d06f2519
Tag 1.2.90 (1.3beta1) release.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5087 3789f03b-4d11-0410-bbf8-ca57d06f2519