combined meters: when set to text, concatenate instead of equal split

[M95D]

For some combined meters, such as memory+swap, when set to text mode, their components are very different in length. Mem has much longer text than Swap.
Even when there is enough width for both meters, the longer one is truncated at half the available width where the second meter begins, leaving lots of empty space at the end.

I propose that combined meters, when set to text mode, should be concatenated (with one space separator) and truncated only at the end if necessary.
Alternatively, the second meter could be aligned to the right, leaving empty space in the middle or, if there is not enough space, truncate the first meter to fit all text of the second one.

I also propose having a Zram+Swap combined meter. Zram is commonly used for swap on embedded devices where no storage is available other than nand/flash with limited erase cycles. It makes sense to combine with swap.

Thank you.