Fix: Loading issues on malformed parameters

[Waguramu]

Goal: prevent app/data loading issues when already saved parameters are malformed if the definitions were changed or updated.

Scope:

• Parameters service.

Deliverables:

• Validation code for parsed parameters.

How to test:

1. Build with as usual.
2. Serve with mapget.

Notes:

• Added missing properties/keywords for editor autocomplete.

[Waguramu]

• Investigate why parameters aren't always picked up form URL correctly
• Validate query parameters as well (e.g. against RangeErrors)

[josephbirkner]

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