rework log macros; add trace level

reworks the log macros to be generated by a loop

adds a trace level. this level is only logged when in :dev. by default, only the current project is :dev, but deps can be put in :dev mode by adding env: :dev to the dep spec

for reviewer:

• Are my comments clear enough to explain what the AST bit is doing?
• Is the env: :dev setting the correct way to configure this, or would a config flag make more sense here?