Support dynamic Field Groups

On JCR level, a field group and its order can be defined by using a 'hst:fieldgroups’ multi string property of component parameter configuration node. 

[hst:componentdefinition]
...
- hst:fieldgroups (string) multiple
//Should be used only for field group parameters
- * (string) multiple 

If a field group is defined both through JCR and annotation, then JCR definition supersedes the one defined by annotation.

A Field Group parameters can be defined by adding to a catalog item node (hst:componentdefinition) a new multi string property using the following naming convention: 

hst:fieldgroups.[FIELD GROUP KEY]

Example:

If the following groups are defined within hst:fieldgroups multi-property:

• Foo
• bar.key
• Foo With Space

Then the following multi-properties that represent parameter names for the groups above should be created:

• hst:fieldgroups.Foo
  • param1
  • param2

• hst:fieldgroups.bar.key
  • bar.email
  • bar.name

• hst:fieldgroups.Foo With Space 
  • document
  • image

If the same field group parameter is specified in multiple field groups, then the only parameter specified within the first field group is effectively used.