Feature/accept secondary color to generate theme

[kavi707]

Two color inputs for theme generation

This introduce user can generate a theme with two color inputs. Reason for this is some apps will have two colors for there design.

commits:

• Fixed the issue in color blending logic
• Created the code documentation and method comments for new change.
• Introduce a new initialize method to initiate the KvColorPalette with…
• Introduce new methods to generate theme palette using 2 input colors.
• Introduce new method to ColorUtil.kt for blend two colors.
• Remove all deprecated functionality for the new release.