auth-utils: Use handle_request in creating the server
it just handles one request and the server is terminated automatically

actions: Fix shellcheck in ubuntu

[BUGFIX] auth-utils: Use loopback method to fetch authorizaton code | F…
…ix #183
It will use either netcat or python3 to start the http server
Now no need to copy paste the authorizaton ccode manually
https://developers.google.com/identity/protocols/oauth2/native-app#create-code-challenge

common-utils.sh: Fix _json_escape function for OSX sed | Resolve #162

[BUGFIX] Resolve #160 | Missed in 040981c

[FEATURE] Add -SM/-sm/--share-mode flag | Resolve #139
Specify the share mode for sharing file.
    Share modes are:
    - r / reader - Read only permission.
    - w / writer - Read and write permission.
    - c / commenter - Comment only permission.
    Note: Although this flag is independent of --share flag but when email is needed, then --share flag use is neccessary.
In output, show which mode used for sharing file
	(SHARED[w]) means shared with write perms

gupload: _cleanup_config: Don't try to parse empty lines
will lead to _cleanup of whole config if access token expiry is missing

gupload: _cleanup_config: Don't try to parse empty lines
will lead to _cleanup of whole config if access token expiry is missing

gupload: Always exit after --update or --uninstall flag is used

gsync: Fix gsync not working with gdrive folder name with space | Fix #…
…126
use eval to to escape the extra qouting