Settings update only after vscode reload

[Tadaboody]

Bug report:

• Change a setting - for example coverage-gutters.showLineCoverage
• Line coverage visibility will not change, even after unwatching/rewatching coverage
• Reload vscode using the Reload window command or restarting vscode
• Line coverage visibility is updated

Other extensions don't seem to have this problem, perhaps we can try and compare our approach to other open source extensions.

[ryanluker]

@Tadaboody this is a known one but I havent got around to fixing it. Essentially we just need to not cache the configStore and instead have it pull every time (from the users settings) someone asks for a variable from it.

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