#1253 Enhance compiler plugin to save time when working with workspace's

[Andrew Cottrell]

If you have a workspace with multiple projects and the projects have a dependency then when you build/rebuild/clean the target then it will build/rebuild/clean the dependencies and as such waste time and slow you down as you have to wait for the action to be done on the dependencies.

This patch does two things as follows:
1) Disables the dependency check if you build/rebuild/clean a target, but not for workspace build/rebuild/clean.
2) Adds to the project target pop up the ability to build/rebuild/clean a workspace if the target is loaded from a workspace.

This patch can be applied independently of ticket 1251, but the build/rebuild/clean a workspace menu items will be displayed for a project instead of just a workspace. When ticket 1251 is fixed then this will be fixed.