Further extends #6807 and #6746 with more Format 2 workflow tweaks.

This:

• Switches most format 2 workflows to use test_data separation and in keyword for connections introduced in Support for Enhancements to gxformat2. #6807.
• Uses new id map based workflow input and output definitions.
• Revs gxformat2 to allow these enhancements and to handle subworkflows, post job actions, and pause steps.

The id map based approach replaces arrays for inputs and outputs. Like CWL both are allowed, but also like CWL the newer id map based approach is probably preferred.

For an input definition, the following diff describes the change:

 inputs:
-  - id: input1
-    type: data_collection_input
+  input1:
+    type: collection
     collection_type: list

For simpler data inputs without extra modifiers, a simpler map can be used:

 inputs:
-  - id: input1
+  input1: data

For an output definition, the following diff describes the change:

 workflow_outputs:
-  - id: outer_output
-    source: second_cat#out_file1
+  outer_output:
+    outputSource: second_cat/out_file1

While not particularly more concise, it does bring the syntax inline with CWL - which uses outputSource on workflow steps instead of source.