Feature request: Support statements on forms and senses

It is not clear whether the setting of properties are implemented. And if it is implemented what format the input has.
For instance, the below example did not set up the properties.

```
CREATE
LAST LEM hestekraft
LAST LC Q1084
LAST LANG Q9035
LAST LANG_CODE da
LAST P5185 Q1305037
LAST P10831 "COR.41802"
LAST P5187 hestekraft
LAST CREATE_FORM
LAST Rda hestekraft
LAST GF Q98946930
LAST GF Q110786
LAST GF Q53997857
LAST FP10830 COR.41802.110.01
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekraften
LAST GF Q98946930
LAST GF Q110786
LAST GF Q53997851
LAST FP10830 COR.41802.111.01
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekræfter
LAST GF Q98946930
LAST GF Q146786
LAST GF Q53997857
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekræfterne
LAST GF Q98946930
LAST GF Q146786
LAST GF Q53997851
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekrafts
LAST GF Q146233
LAST GF Q110786
LAST GF Q53997857
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekraftens
LAST GF Q146233
LAST GF Q110786
LAST GF Q53997851
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekræfters
LAST GF Q146233
LAST GF Q146786
LAST GF Q53997857
LAST END_FORM
LAST CREATE_FORM
LAST Rda hestekræfternes
LAST GF Q146233
LAST GF Q146786
LAST GF Q53997851
LAST END_FORM
END
```

```

Start by reproducing the supplied input containing CREATE_FORM, END_FORM, and the form and sense statements, then trace where those statements are parsed or ignored. Done means statements on forms and senses are supported and the accepted input format is documented; the issue names no files or tests to guide the work.

Written by the indexing model from the issue text.