Add `fmt.*printfln`

[Tetralux]

Adds the following procedures, which just call through to the printf versions, with newline = true; a new parameter also added in this commit. In all cases, wprintf is the one that ultimately writes the newline, if requested.

• printfln
• fprintfln
• eprintfln
• aprintfln
• tprintfln
• bprintfln
• caprintfln
• ctprintfln
• sbprintfln
• wprintfln

These procs are useful as I often find myself switching between println and printf, and often find myself wanting the newline.

I originally just cutnpasted a version of *printf that also added a newline, but after doing so I figured that adding a newline := false parameter to the *printf procs might be a neater choice, so that's what I've done here.

I also noticed while doing this that something similar could be done with *print vs *println, but I've left that out of this PR.

[Tetralux]

Ready