Clear several ShelLCheck issues in functions.sh:   - Add lots of double quotes   - Add disable directives   - Replace which with command -v
Clear several ShelLCheck issues in functions.sh:
  - Add lots of double quotes
  - Add disable directives
  - Replace which with command -v

jhwohlgemuth/techtonic-datastore,jhwohlgemuth/techtonic-env,jhwohlgemuth/techtonic-env,jhwohlgemuth/techtonic-datastore