code comprehension

[GopherAtl]

add system - possibly expanding on the syntax hilighting - to partially parse the code, identifying and tracking things like function definitions and variable assignments. Then apply this metadata in a variety of ways - jumping to function definitions and variable initializations; refactoring to rename functions/variables; detecting possible errors without requiring execution , like duplicate names in the same scope, or using uninitialized variables.

Possible focus for features of v1.3