[regex_module]: Introduction of a new module where most useful regex will be stored and explained

[Issue#85]:Removed hardcoded precision, now VariablePrecision module is used

[Issue#85]: Changed .working_precision to .wp  everywhere

[Issue#81]: Now pointer to functions are correctely traced. Fix for dimension function and logical var.

[Issue#81]: Refactor of MainFunction, things were scattered all over. Now use statement is correctly propagated, then var are added right away to public

[Issue#81]: Derived_types members should not be added to the main sbr, instead they have to appear in vault.variables array

Issue#83

See merge request otinto/AutoRPE!14