colvalue, coltext key can be a path within data

Extended option to lookup for data in cell (assuming it can be object)
when key (colvalue, coltext) is specified using separator '/'

Example:

```javascript```
[ 
{user: { id: 1, email:"te@st.tld"}, ...
{user: { id: 1, email:"te@st.tld"}, ...
]

colvalue: user/id or coltext: user/id