Move Toolchains directly under C/C++ and rename to Core
Build Toolchains. Add a label describing what the toolchains
are for in hope of avoiding confusion with managed build.
Also move Qt into C/C++.
Change-Id: Ia1d76087c65b26562d1001243ea355c7ac32365e
Provide a way to add new toolchains. Also start of UI to allow for
reordering them to help with toolchain selection for targets.
New Generic Target Wizard for the new wizard2 extension point for the
Launch Bar Target UI.
Change-Id: I60635ab27dad5b69df72c339337473183dcf711a
Use launch target os and cpu arch properties to pick toolchains and
toolchain files. UI to add toolchain files. And build support.
Also some clean up of Qt as I found bugs.
Change-Id: Icd1da43460b5954eea15e95ed8ec27850fc4e54e
