Removed static TimeProvider

[thomasgrassauer]

• Moved methods to TimingProvider interface
• Pass instance to Beacon
• Replaced calls to static provider

To be discussed: I added the method getCurrentTimestamp in Beacon. The beacon is known to all components that require the timing info. Otherwise we need to find a different solution to set time information in Actionand Session (e.g. a ref to the timing provider, set in external component, ...)

[thomasgrassauer]

@stefaneberl the issues was fixed in the last commit