Parse hex triplet token e.g. #FFFFFF

[Catalin-Andronie]

The hex triplet token is required to represent color for table setting, e.g. [headercolor: #3498DB].

Check more about the headercolor table setting here #49.

Example,

Table TableWithSettings [headercolor: #3498DB] {
    id integer [primary key]
    username varchar(255) [not null, unique]
}