LICENSE.build for wraps tracking

[sarum9in]

As discussed in IRC we plan to do the following migration:

1. We introduce LICENSE.build (MIT) for all wraps. We put it to existing version and master branches, and we update repoinit.py tool.
2. We ask for permissions from all contributors except @jpakkane to have code released as MIT.
3. We don't support branches without LICENSE.build, this includes the case when contributor is not responding.
4. We create new branches for upstream versions from scratch if we can't reuse existing build files and put LICENSE.build there.