v4.0.11 Removed some more non-public API's

Bugfixes:

• Removed some more references of private API's(We previously added those non-public API's for workarounds #865).
• Fixed a text alignment issue with IQTextView (Thanks to @yurihan)
• Fixed an issue where _kbSize variable wasn't clearing when library is disabled.

Improvements:

• Splitted storyboard into multiple storyboard to improve demo performance.
• Added brief flow diagram for quick understanding.

Deprecations and Removed:

• Removed isAskingCanBecomeFirstResponder because this no longer useful now.