Add Inverted color flag for monochrome modes

[sbrin]

As a user I want to draw any objects on top of other filled area to be visible. Like draw the black text on top of white box.

For u8g2 use u8g2.setDrawColor(2);

Find if Adafruit and FlipperZero has something similar, implement as well

• Make it a flag for any layer
• For code preview add setDrawColor call before layer code if flag is true

[sbrin]

Maybe use colours feature and provide just two colors for monochrome displays instead of a flag

[sbrin]

Added in https://github.com/sbrin/lopaka/releases/tag/0.4