New formatting for defining layouts

[eddieantonio]

@eddieantonio Here's a proposal for defining panes. Row and column labels are marked with _ and |, respectively (in comparison to < and ^). Both labels, but in particular the column labels can have a hierarchy, which is used to organize the panes according to available space. One can also use the column labels to refer to the panes. What is not indicated as a label is a reference to an FST-generated form. In this format, the forms are specified in full, indicating the lemma slot with {{lemma}} - this means that one would not necessarily need a separate specification/file for the paradigms and their generation.

[edited to introduce row hierarchy as well]

             | AI | Prs | Ind
_ Sg _ 1Sg   {{lemma}}+V+AI+Ind+1Sg
_ Sg _ 2Sg   {{lemma}}+V+AI+Ind+2Sg
_ Sg _ 3Sg   {{lemma}}+V+AI+Ind+3Sg
_ Pl _ 1Pl   {{lemma}}+V+AI+Ind+1Pl
_ Pl _ 12Pl  {{lemma}}+V+AI+Ind+12Pl 
_ Pl _ 2Pl   {{lemma}}+V+AI+Ind+2Pl
_ Pl _ 3Pl   {{lemma}}+V+AI+Ind+3Pl
_  _ 4Sg/Pl  {{lemma}}+V+AI+Ind+4Sg/Pl
_  _ X       {{lemma}}+V+AI+Ind+X

             | AI | Prs | Cnj
_ Sg _ 1Sg   PV/e+{{lemma}}+V+AI+Cnj+1Sg
_ Sg _ 2Sg   PV/e+{{lemma}}+V+AI+Cnj+2Sg
_ Sg _ 3Sg   PV/e+{{lemma}}+V+AI+Cnj+3Sg
_ Pl _ 1Pl   PV/e+{{lemma}}+V+AI+Cnj+1Pl
_ Pl _ 12Pl  PV/e+{{lemma}}+V+AI+Cnj+12Pl 
_ Pl _ 2Pl   PV/e+{{lemma}}+V+AI+Cnj+2Pl
_ Pl _ 3Pl   PV/e+{{lemma}}+V+AI+Cnj+3Pl
_  _ 4Sg/Pl  PV/e+{{lemma}}+V+AI+Cnj+4Sg/Pl
_  _ X       PV/e+{{lemma}}+V+AI+Cnj+X

The relabeling of the row and column labels, allowing for alternative schemes, is based on crk.altlabel.tsv. Space allowing, the two panes could be presented next to each other, in which case only one set of row labels would be necessary, and the column label for tense could be shared. If space would require the above to be presented in a single column vertically, then it would be a matter of UI design whether tense would be indicated as a column label for both panes, or only once.

Originally posted by @aarppe in #167 (comment)

[eddieantonio]

This is essential for addressing #568.

[eddieantonio]

This combines:

• Feedback on paradigms #567
• Row/column titles might need more differentiation from cell content in the paradigms #568
• Better layout specification for paradigms #581
• Convert layouts to follow new improved format #582

Also related:

• Develop and switch to multi-pane layouts #167
• Both column headings for the basic mobile layouts should have the same formatting (bold etc.) #193