Various enhancements for input type recognition and CSS

[kartik-v]

• input type property will be defaulted to text if useNative is false and will default to color if useNative is true
• input type property is now made configurable
• plugin loading indicator will be shown until spectrum plugin loads - if pluginLoading is true
• will be complemented by enhancements Enhance Html5Input to accept more input types yii2-krajee-base#50, Add plugin loading CSS for HTML5 input yii2-krajee-base#51