v1.6.0 : var inside header or footer (#33)

Add fonts that are recommended

use counters for counting elements (#29)

counter management (#28)

* counter management

* better scan for if statements

* html statement velocity

* doc and scan speedup

* speedup for and better scanning

* disclamer for heading automatic numbering

Major refactoring, separated statements (#27)

* Major refactoring, separated statements

* new statements : text, table, image

* tag version v1.3.0 in readme

* new unit tests

fix : revert TextShape testing (#26)

* fix : revert TextShape testing

* README updated