Enhance validation when building

[davenice]

@davenice commented on Thu Jun 27 2019

Validate during build to match existing validation in CICS Explorer where possible.

• name of generated bundle part (valid characters, no spaces)
• jvmserver name validity ... probably don't want to mandate because of option to allow default JVM server for the region
• verify behaviour if dependent Java project doesn't build cleanly
• ...?