ValueControl needs be configurable to avoid utterance conflicts (port ask-sdk-controls/pull/9)

[mikelid-zz]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Other... Please describe:

See Issue #8
and PR #9

This issue is to port the same functionality to ValueControl.

It should be possible to create a ValueControl that will accept values [yes|no|maybe] without causing utterance conflicts with AMAZON.YesIntent etc.

Given the changes made in #9, the work is to add new props to allow configuration of filteredSlotType and an intentToValue mapper function.

Expected Behavior

Current Behavior

Possible Solution

Steps to Reproduce (for bugs)

Context

Your Environment

• ASK SDK Controls used: x.x.x
• Operating System and version:

Node.js and NPM Info

• Node.js version used for development:
• NPM version used for development: