Separate the HTTPS statement under one heading

also update examples to use HTTPS
Add audit for versioned casks with no checksum

* Check if version is not latest and has a sha256 :no_check for checksum
Fix SwitchResX with a version and sha256 to pass test
GPSBabel download URL updated
LTSpice cask made more generic
Add texstudio.app v2.7.0
Mountain cask made more generic
Navicat products updated to 11.0.18
Mountain appcast URL added
Postbox updated to latest version
StrongVPN Client updated to 1.0.4
StrongVPN Client appcast URL added
Tactor cask made more generic
Tagoman cask made more generic
updated instacast (1.2.4 (2250))
regularize whitespace
Note about Dropbox URLs added