[ANN] GeneralizedGenerated.jl: less restricted @generated functions and runtime eval mechanism

Package Announcements
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Introduction

Roughly:

Use case 1: Runtime eval

julia> module WorldAgeProblemRaisedHere!
           do_this!(one_ary_fn_ast::Expr, arg) = begin
               eval(one_ary_fn_ast)(arg)
           end
           res = do_this!(:(x -> x + 1), 2)
           @info res
       end
ERROR: MethodError: no method matching (::getfield(Main.WorldAgeProblemRaisedHere!, Symbol("##1#2")))(::Int64)
The applicable method may be too new: running in world age 26095, while current world is 26096.

julia> module WorldAgeProblemSolvedHere!
           using GeneralizedGenerated
           do_this!(one_ary_fn_ast::Expr, arg) = begin
               runtime_eval(one_ary_fn_ast)(arg)
           end
           res = do_this!(:(x -> x + 1), 2)
           @info res
       end
[ Info: 3
Main.WorldAgeProblemSolvedHere!

Use case 2: generalized generated functions

using GeneralizedGenerated

@gg function f(x)
    quote
        a -> x + a
    end
end

f(1)(2) # => 3

Known cases not working and workarounds

Special thanks to

@cscherrer

Future and what I expect

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