extract XMIR-to-EO printing to a new repository

[yegor256]

I suggest we create a new repository (objectionary/pretty) that will implement pretty printing of XMIR to EO. Let's move Xmir.toEO() function over there (together with the /org/eolang/parser/print/to-eo.xsl XSL). Also, it seems we can just delete the Xmir.toReversedEO() function.

Later, we'll use print goal of our Maven plugin in auto-formatting: objectionary/eoc#443

[yegor256]

@maxonfjvipon WDYT?

[maxonfjvipon]

@yegor256 why do we need this? What are potential benefits?

[yegor256]

@maxonfjvipon printing/formatting of EO is a rather big task by itself, similar to linting, which we've moved to the lints repository recently. Similarly, in Rust it's https://github.com/rust-lang/rustfmt

[maxonfjvipon]

@yegor256 what about converting EO to PHI and back?

[yegor256]

@maxonfjvipon PHI formatting doesn't have as much variability as EO formatting. We can simply format it one way, in the PhiMojo.

[h1alexbel]

@yegor256 @maxonfjvipon can we kick-start this?

[yegor256]

@h1alexbel yes, let's do it: https://github.com/objectionary/pretty