Initial work on build support (code is mostly based on CustomMakeBuild plugin).
For testing, open a folder with golang project and choose "Go project manager".
Known bugs:
1) ~~No "build" \ "install" \ "clean" buttons on right-click menu in projects view. However, "Build selection" works.~~ Fixed, now project folders are "build folders" so they are buildable.
2) No error messages from Golang in case something is wrong - only exit code is shown. (Could be easily tested with running "install" in case project is not in GOPATH)
3) Probably something more.
Another ToDos:
- Add support for configuring GOPATH and go executable path
This revision is work in progress and was created to share status and receive suggestions \ nitpicks.
So, any opinions are welcome!