Feat/run command

[boonwj]

Description

This PR introduces the run keyword that will be used to execute user defined commands. This fundamentally changes the way 1build is used.

The previous implementation treats all non-reserved arguments as user defined commands, whereas now the run keyword has to be explicitly provided before 1build treats it as a user defined command.

The motivation for this feature can be found in the issue link.

Fixes/Implements: # (issue)

#179

If New dependencies introduced

N.A

Checklist

• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have update README (If needed)

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[gopinath-langote]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- cmd/run.go  1
         

Clones added
============
- cmd/run.go  1
         

See the complete overview on Codacy