Fix/broken cli

[bugalot]

This PR aims at fixing the render command of the CLI.

• It includes an update of library wp-cli/php-cli-tools to version 0.12.1.
• It also include a fix for a previous change that made the render command broken.
• Makes possible to use relative paths as CLI argument.

In order to test, invoke from CLI the following command which should not return any error.

./bin/qtisdk render -df --source test/samples/ims/items/2_1_1/choice.xml --flavour goldilocks

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.23%. Comparing base (2776840) to head (bb879f9).
Report is 88 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/qtism/cli/Render.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #408      +/-   ##
=============================================
- Coverage      91.37%   91.23%   -0.15%     
+ Complexity     10465    10306     -159     
=============================================
  Files            947      947              
  Lines          26102    26182      +80     
=============================================
+ Hits           23852    23887      +35     
- Misses          2250     2295      +45     

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