S12.01-Exercise-DimensionsColorsAndFonts

[HasanElHefnawy]

These entries were added in dimens.xml, but never used:
today_icon
list_item_icon_margin_end
loading_indicator_size
list_item_high_temperature_margin
list_item_low_temperature_text_view_size

These entries have ambiguous names and need to be named clearly:
forecast_temperature_space (should be named list_item_high_temperature_margin)
forecast_text_size (should be named list_item_temperature_text_view_size)