Use PrecompileTools to locally disable precompilation for dev

[Affie]

#664 (comment)

It's actually really easy, here is the link to the doc:

https://julialang.github.io/PrecompileTools.jl/stable/#Package-developers:-reducing-the-cost-of-precompilation-during-development

fiy @dehann

[Affie]

So we can remove the ENV variable "ROMEJL_SKIP_SNOOPPRECOMPILE"