re-write reporting system

[conig]

The current system of reporting is unecessarily convoluted and difficult to maintain. We should move to a glue style system where all relevant variables are loaded into the function's environment. Then users will be able to easily modify the pattern in order to call relevant statistics using standard glue notation.

This new function should have the same default behaviour and similar arguments for back-compatibility.

E.g.

"There were {n_studies} studies and {n_effects} effects. The pooled effect size was {pooled.est} [95% CI {pooled.lower}, {pooled.upper}]. The significant moderators of the baseline model were {moderators.sig}."

[conig]

This is being put on hold with move to new package metaKIN.