[Typescript][Fetch] Fix bugs with new typescript-fetch generator

Created by: someone1

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

Fixes multiple issue with the update typescript-fetch generator

• fix #1535 (closed) - always initialize the queryParameters variable
• fix #1546 (closed) - use parameter type Date when a string is formatted as date or date-time
• fix #1547 (closed) - use allVars template variable for serializing/deserializing models. Pay attention to readOnly parameters.
• fix #1561 (closed) - omit time component when serializing parameters with format: date
• Update tsconfig.json to include "moduleResolution" : "node", option
• fix #1565 (closed) - add enums found in api operations

@TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @nicokoenig (2018/09) @topce (2018/10)