improve how labels are displayed

[TrimmingFool]

I wanted to make the old label display My Label (100; 123 GiB) look better. Here is what I came up with:

In the settings the user can now choose to:

• Show state size in pstate
• Show label size in ptrackers and plabel
• Show search size in flabel

plabel also shows the label sizes for All and No Label (something like this was requested in #2168)

prss also displays new label counts but no label sizes

I adjusted how the labels are displayed for all themes in this repo.
They are themed with the classes: label-text label-count label-size

Hints

The theWebUI.labels values with keys -_-_-label-_-_- now are objects of label count and label size
e.g. theWebUI.labels['-_-_-label-_-_-'] = { cnt: 0, size: 0}

stateLabels store which staticLabels = ['dls','com','act','iac','nlb','err'] a torrent hash has
e.g. stateLabels[hash] = ['nlb', 'com', ... ]

create new label elements with theWebUI.createSelectableLabelElement
and update label elements with theWebUI.updateLabel

[stickz]

What do you think about removing the zeros from the end of the file size? For example, 200.00 MiB could be 200 MiB instead.

Perhaps, we could also let the user select how many decimal points to display for kilobytes, megabytes, gigabytes and terabytes. If I have 1TB of free disk space, I don't need to know if a label is 320.99 KiB. I would just care that it's 321 KiB.