Consider changing legally capable into an observation or a flag

[HarmkeKoning]

Based on discussion with Niek and Eduard the suggestion was made to consider an observation or flag for the legally capable boolean instead of an extension.

[MariekeMassa]

Let's make a draft for an observation to see if this can fit the purpose. There's no snomed code fitting the legal capability regarding medical treatment decisions. If we want to proceed with this, we should make a request for a code (prefereably international). For the draft, we can use 304686002 | vermogen tot weloverwogen keuze maken (waarneembare entiteit)

[MariekeMassa]

First draft is made. Harmke will start process of discussing it (share build of branch) with stakeholders, for which we need:

• information on requested snomed code
• explanation of process of 'establishing' the observation (input from Manon)