Added testing tool - "SBE-Scripts" + support getting variable with SBE-Scripts

Available variants for getting:

MSBuild core:
* * $(name)
* * $(name:project)

SBE-Scripts core:
* * #[var name]
* * #[var name:project]

Variants for definition:

* #[var name = mixed]
* #[var name:project = mixed]
+DTEComponent exec operation

Example: #[DTE exec: Build.SolutionConfigurations(Debug)]

+ Changed the namespace for exception of MSBuild & SBE-Script
Implemented #[Build cancel = true|false|1|0]
Implemented IsBuildable & IsDeployable properties

* Issue #24
* Samples:

* * `#[Build projects.find("name").IsBuildable = true|false|1|0]'
* * `#[Build projects.find("name").IsBuildable]'
* * `#[Build projects.find("name").IsDeployable = true|false|1|0]'
* * `#[Build projects.find("name").IsDeployable]'