More conditional and loop snippets (#165)

* feat: update if snippets

Add snippets for comparisons

* feat: update while snippets

Add comparison snippets.

* feat: update for snippets

Add snippets for ranges and files.

* fix: remove duplicate items

Reduce snippet amount by removal of some snippets related to
syntax constructs.

* feat: simplify block and closure naming

* fix: stepped range

* fix: def and completion snippets

* feat: simplify type choice

* feat: support --wrapped option for def

Author: EmilyGraceSeville7cf