BAT updates

[MSECode]

This PR implements the improvements required in https://github.com/robotology/icub-firmware/issues/476 .

Changes of this PR:

• Update status bat to uint16_t for struct eOas_battery_timedvalue_t valid for both BAT and BMS devices
• Add total absorbed current to BAT yarp port
• Set BAT port voltage as the INPUT voltage
• Move the calculation of the BAT Battery_Charge from the methods related to the display only to a proper place with an ad-hoc function
• Update bat v1.3.4, ems v3.87, mc4plus v3.90, mc2plus 3.69, amc 2.2

Related to:

• https://github.com/robotology/icub-firmware-shared/pull/95
• https://github.com/robotology/icub-main/pull/953
• https://github.com/robotology/icub-firmware-build/pull/146