Add env variable parsing for SLDService

Description

A vector layer, or a mosaic, can be defined with a CQL filter based on enviroment variables.
Said variables then control the contents of the raster or vector, thus changing the results of the classification.
As a result, it's important to allow the specification of env variables in classification calls.

Environment

None

Status

Assignee

Andrea Aime

Reporter

Andrea Aime

Triage

None

Fix versions

Affects versions

None

Components

Priority

Medium
Configure