Moved SUBJECT_AREAS into the Subject lists for GYS and VUXGRS

The SchoolType GYS_SUBJECT_AREA has been removed and is now part of the GYS schooltype.
This to align with the GRS structure.

Also fixed a bug with GRSPKOU01 not being marked as a SUBJECT_AREA.

Support for VUX GRS

Added the new schooltype, VUX Grundsärskola.

Fix new HTML structures in subject purpose and central contents.

In the latest update from Skolverket new HTML constructs appeared in the HTML texts. It was basically a lot of nested divs without any significance. This version of the parser removes these divs before analyzing the text as before.

SFI + Fixed CentralContent parsing for some courses

Added support for SFI.
Fixed some central-content sections that had a strange/broken markup in GRS.

Updated structure for special school

New Schoolforms to better handle the content for special school
See #51 for more info.

Subject Areas

Added support for Subject Areas in Upper secondary school for Individuals with
learning disabilities (GYS).

Subject Areas has no courses, a constructed course is returned by the parser with the same code as the subject. There are 6 subject areas in total.

Updated GRSPEC

Added special cases for sign language.

GRS updated

Year groups for lower years in subject areas (GRS) now have copied knowledge requirements from grade 9.
In moderna språk, the HTML was totally different for list representations, this is fixed so that its handled correctly.

Changed TN (Teckenspråk) to align with other languages

TN is now coded in the same structure as Elevensval and Språkval.

Requiremets for all subjects

0.5.1

Version bump