Add inverted color mode and Confirmation message to Framebufferizer.

This patch allows specifying the confirmation message and the inverted
colors flag in the user interface. It also slightly improves the
configuration page layout of the Framebufferizer tool.

Test: LD_LIBRARY_PATH=./out/host/linux-x86/lib64 TeeuiFramebufferizer
Change-Id: Ieea6f7c4cf90291edb749cf0f55ba5385d93c64e
7 files changed