NamingConvention and defaultLayer

[qfox]

Knowledge of defaultLayer should not be a part of "naming.cell.match" package.
Can we write some sort of convention normalizer?

Feels like it can be a container with normalization functions like Cell, EntityName, etc.

This container should check and resolve fields for naming, fs delims, and anything else we use in naming presets:

• fsDelims:

  const dElem = 'elem' in dd ? dd.elem : (delims.elem || '__');
  const dMod = 'mod' in dd ? dd.mod : (Object(delims.mod).name || (typeof delims.mod === 
  'string' && delims.mod) || '_');

• asserts:

  assert(conv.fs && typeof conv.fs.pattern === 'string',

• knowledge about defaultLayer and common (?)

  const layer = conv.fs.defaultLayer || 'common';

        pathStringify({
            layer: cell.layer || 'common',
            tech: cell.tech,
            entity: schemeStringify(cell.entity) + entityStringify(cell.entity)
        }));

• defaults in cell.match:

  const buildPathParseMethod = ({ fs: { pattern, delims: dd = {}, scheme = 'nested' }, delims, wordPattern: wp = ALPHANUM_RE }) => {

• Pull in path parsers and builders for schemes.