Digital Face Feature Updates and Refactoring

[optoisolated]

• Activity Box now cycles between the following every 3 seconds.
• • Steps
• • Voltage
• • Change Rate, and
• • WiFi Signal Strength (when on)
• When IMU movement is detected, the Steps is always shown. It will resume cycling when not moving.
• Significant updates to watch face rendering and text readability
• Re-rendered base face to improve readability
• Consolidated Bitmaps for Digital Watch Face into Single File
• Tidied up some of the fonts
• Disabled Activity Box Icon (looked silly)
• Battery now assumes charging when VBUS Present (more responsive than using change rate)
• Added Battery Time Remaining functionality.
• • Uses an averaged (128 samples) of the Change Rate, and current battery % to calculate an hours-remaining.
• • Returns 0 until at least 16 samples are recorded. A sample is taken every 5 seconds
• • Change rate is not tracked if VBUS is present, and Change Rate is Positive. (Only tracks discharging)

TODO:

• Remove unused fonts
• Fix LCD_OFF State of Date, Day and Activity text.
• Still need to get palette cycling working.
• • Will create 5 or 6 palettes to choose from.
• • Need to find a way to reload the bitmap with a selected palette when changed
• • Small up/down swipe will change palette.
• Battery Time Remain should include cached responses and force option (~60 seconds?)