Button state should reflect its state

[OliverRhyme]

Describe the bug
Button should stay at either error or success state unless the backing state is modified. It should not return on the idle state (ui-wise) automatically if the state does not reflect.

To Reproduce
Steps to reproduce the behavior:

1. Set the state to either error or success

Expected behavior
It should stay in its set state and not automatically go to idle even if it is just ui-wise.

Smartphone (please complete the following information):

• All

Additional context
This makes the library so opinionated and does not give the developer flexibility. It is also a common anti-pattern with declarative style ui to have a side-effect when state is changed. This kind of behavior also will not conform to single source of truth, and will cause the library to have unexpected behaviors.

[yashwantgowla-simform]

@OliverRhyme This issue requirement has been fixed in this PR #50. Please check and confirm when you get a chance.