autobuild: initial manual cycle breaking

[GZGavinZhao]

Summary

Add autobuild.yml files to help cycles breaking.

Related: getsolus/ypkg#45

[joebonrichie]

Slightly unrelated but introducing checkdeps in package.yml would solve a fair few of these

[GZGavinZhao]

@joebonrichie Thanks for the suggestion! Reilly told me that boulder has them as well, so I think it would be a good idea to add an extra field called checkdeps that is functionality-wise equivalent to builddeps except that it helps dep solving.

[ermo]

Suggestion:

Add the ability for ypkg (and boulder) to interpret so-called "Auxiliary Dependencies". See the issue for the proposed implementation syntax (suggested by Ikey).