[Qbs] 1.19 branch created

[Richard Weickelt]

Hello,

we branched off Qbs 1.19 today. Scheduled release date for
version 1.19.0 is mid of April (together with Qt Creator 4.15) [1]. We
recommend users to try this branch with their projects and report back any
new problems they find. Snapshots of Qt Creator can then be obtained from [2].

Contributors are requested to push bug fixes and small, zero-risk
improvements to this branch, while features continue to go to master.

Patches currently under review can be moved if they are reasonably close to
finished.

Richard

[1] https://wiki.qt.io/Qt_Creator_Releases
[2] http://download.qt.io/snapshots/qtcreator/4.15/