counter management

[philippe-levan]

It is a counter system that allows syntax like the following inside the templates

chapter [counter chapter] : introduction

chapter [counter chapter] : context

[counter paragraph] : geopolitical context

[counter paragraph] : geographical context

[counter paragraph] : economical context

chapter [counter chapter] : analysis
[counter.reset paragraph]
[counter paragraph] : geopolitical analysis

[counter paragraph] : geographical analysis

[counter paragraph] : economical analysis

Changes

• add a counter system inside templates
• add better scan for if statement. Raises an error if there is too many endif in the template.
• speedup html statement replacement and scanning
• speedup for statement replacement and scanning
• tests of for scanning
• internal : add scan testing inside content unit tests

Checklist

• [x] If code changed were made, they have been tested.
• [ ] This pull request fixes an issue.
• [x] This pull request adds a feature.
• [x] The code has been tested.