feat(configLoader): add cosmiconfig support

[levi2ki]

Added cosmiconfig support; Added json5 support for configs; Removed deprecated czConfig attribute support; Added load and loadAtRoot public api hepers; Removed findup and config normalization functions that are not required for now;

BREAKING CHANGE: config.path now resolves relative to config location; config lookup now relays on cosmiconfig search rules; closes #773, closes #782, closes #975