Reexport subpackages

[ReubenJ]

When using Herb, we usually end up having to also type using HerbGrammar, HerbSearch etc., meaning we don't get any benefit from using Herb in the first place. This change allows you to access anything exported from HerbGrammar, HerbSearch, etc. after only using Herb.

Before, this failed:

using Herb
# needs using HerbGrammar

# or HerbGrammar.@cfgrammar
g = @cfgrammar begin
    a = 1
end

but with this change, it works without the extra using or extra HerbGrammar. before the macro call.

[ReubenJ]

Re-exporting triggers a lot of warnings from Aqua since we haven't been testing. Slowly working through each of the subpackages.

• Address Aqua type piracy errors HerbCore.jl#31
• Add aqua, remove pirated methods HerbGrammar.jl#96