Ensure that application context stays updated for all modules

[JakobGM]

This PR fixes the bug we have discussed when external modules need access to imported context values, but they did not due to ModuleManager.application_context got reassigned and old references became stale.

[coveralls]

Pull Request Test Coverage Report for Build 429

• 21 of 21 (100.0%) changed or added relevant lines in 4 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 97.478%

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Files with Coverage Reduction	New Missed Lines	%
astrality/filewatcher.py	4	97.06%
<!--	Total:	4		-->

Totals
Change from base Build 425:	0.04%
Covered Lines:	3595
Relevant Lines:	3688

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💛 - Coveralls