Renamed parser to translator
Implemented variable expansion
Translations of `req mkd './foo';` statement are supported
Improved `mkd` translation code
Tested `req mkd` for multiple targets (given as strings)
Referencing variables and constants works in `req mkd`
Applying fake cwd works
`mkd` request works
`req cp` request implemented in translator
Tested references in `req cp` request
`req cp` works
Updated runner and docs
Removed old tests (not used anymore)
Implemented comma-related logic, guards against invalid names and bumped version to 0.0.4
Removed fsrl/__main__.py (the tool will be developed spearately from the
library)
Improved variables/constants-related documentation, added support for
faking root- and current-working-directory
Variables and constants can now be set via translator before the
translation (and after but it's pointless) and interacted in source
code.
This gives programmers the ability to use a kind of "environment variables" for example
package manager using FSRL scripts for the software installation can set
a constant `bindir` value via translator - and packagers can use it in
their scripts.

Quite a useful feature, if you think about it.
Version bumped to 0.0.5\; implemented sandboxing \(chroot style jailing\) and improved support for variables and constants \(they can be now set via translator before translation and be interacted with in FSRL source code\)
Updated mention expansion code, documented a limitation of mentions
(the last defined value is used)
Refactored code in translator a bit (variable and constant compilation)