Add support for showing/ hiding pins

[svkaka]

added attribute for the pin
updated sample application

[krazykira]

Thanks for the contribution but i think the solution is not scalable in this way rather i would suggest you update the mrb_temporaryPins attribute from boolean to enum

The following things you would need to add.

1. Define an enum PinDisplayProperties having the values ALWAYS,NEVER,ONLY_ON_TOUCH
2. Add way to change mrb_temporaryPins from xml.
3. Add way to change mrb_temporaryPins from code.
4. Update the sample app accordingly so that we have the ability to see the different properties of mrb_temporaryPins

[krazykira]

we already have a property mrb_temporaryPins and i think this one should be changed so it should have the following three values

1. ALWAYS (This displays them all the time)
2. NEVER (This hides them all the time)
3. ON_TOUCH_ONLY (This displays them when we are modifying the value and then hides them )

1 & 3 can be achieved right now by changing value for mrb_temporaryPins to true and false but the 2nd one is what you have to implement and at the same time you need to change the mrb_temporaryPins

So at the end the mrb_temporaryPins would be changed to something like this

 <attr name="mrb_temporaryPins" format="enum">
            <enum name="ALWAYS" value="0" />
            <enum name="NEVER" value="1" />
            <enum name="ON_TOUCH_ONLY" value="2" />
        </attr>

[svkaka]

makes sense, I will add it

[krazykira]

@svkaka can we have an ETA on the changes. I would like to release a new version in May and this could be added if the changes are done in time

[krazykira]

@svkaka Please resolve conflicts as well