overhaul frontmatter parsing or at least verbosity

[someodd]

weird errors happen where on the one hand it's too permissive and if i forget a colon in the frontmatter it carries on like nothing happened (?) but then tags require the list format []... maybe i need a --strict to make it error out on parse failure and i'm just handling it and NOT seeing the error. There maybe should just be a verbosity flag so only actual errors get displayed when writing out and not the handling status of every file