Allow for showing more detailed usage in MB

[DBaker85]

Is your feature request related to a problem? Please describe.
As a user I would like to be able to see more detailed ram usage in MB

Describe the solution you'd like
Allow MB to be shown in place of GB values via a config file or directly via the sensor data

Describe alternatives you've considered
none

Additional context
Feature as requested by jgrunder

[jgrunder]

Note: To convert MB to GB the division must be by 1024.
KB to MB => / 1024
MB to GB => / 1024
KB to GB => / 1024 / 1024