add a method to return subparsers that can be used by buildtest commands to automatically get list of buildtest commands

… list of valid words to autocomplete for 'buildtest' program

add dictionary self.subparsers that is used to automatically build all the parsers.
Make use of self.subparsers to automatically pick parser when creating the arguments for each parser object.

… of tuples

…ples that are used to build the command option.

This was done for 'buildtest style', 'buildtest unittests', 'buildtest path', 'buildtest history'

create method for building argument parser for buildtest buildspec find
remove short option '-t' for '--theme' since there was a name conflict with
buildtest buildspec find --tags that has short option '-t'

…test inspect list' command

…ash. we use url.join to build

the path as pose to using string manipulation

…reate argument groups.

The options that require mutual exclusion were added manually

… creating a single variable to store

all configuration options

…', 'clean', and 'show' command by using a list

of dict

…compilers list

rewrite section help_all

…method

fix issue with hidden parsers showing up with help message. Now with --help-all it will only show
parser otherwise its hidden
fix issue where buildtest report command was shown twice in 'buildtest --help'
rename several variables

…t commands that can be used by buildtest commands variable to show

all valid commands it wont show the aliases by default

…mands with aliases

by default it will show only main commands

…p' option we added a case statment

to group all commands into one case statement

add tab completion for 'buildtest commands' that includes --with-aliases option

… auto-completing the buildtest options

instead of manually creating them

…eting buildtest option

…ting and globbing reported by codefactor