Add Option to disable Wh reading and display/alerts

[athertop]

I would like to be given the option of entering 0 against 'BatCap Wh' on the Offset screen to disable the Wh monitoring and display.
I personally require more real estate on the telem1 screen to display mAh as I use large cells requiring 5 digits to display this value - as both this value and the Wh values grow, the two fields merge into one on the Taranis Plus display, and the mAh label is overwritten with the Wh value making a line of just numbers which then do not make any sense.
Secondly, even though Wh is the true reading of power consumed, other than it being nice to have that info to hand, it doesn't serve any real practical purpose - Our LiPos are labelled with mAh capacity values (and not Wh), and as most modern chargers do not have Wh readings its increasingly more difficult to determine an axccurate Wh capacity for any one LiPo battery (in order to correctly set the Wh offset in LUA). It seems therefore that the Wh reading doesn't serve any real practical purpose. Having the option at least to turn this off on the display (along with associated alerts/alarms) would be helpful.

[athertop]

The ability to set Wh Capacity to 0 in offset.lua has already been implemented - this removes the Wh alarm entirely - it also renders the battery meter inoperative though (will always show 100%).
Need to give more thought to the original request and whether the battery meter should be switched to be based on mAh instead - would require user to specify the mAh capacity of their LiPo instead of Wh - which makes more sense given the more limited info available from LiPo chargers of today (the inability to access charging Wh info to properly calibrate the Wh telemetry offsets).