Edit/Add a field on layers failed

[qifeng-bai]

Link: https://spatial-test.ala.org.au/ws/manageLayers/field/1085

When we choose 'Edit layer" -> "Add field", the saving/updating process fails

1, Incorrect Form:

On Dev/Test

On prod

2, Creating a new field failed due to possible duplicated id / requestId.
Fix:
automated increment of request id based on naming convention
Change request id field to readonly

3, updating 'enable/disable' status does not work.
When we submit a 'checkbox', if it is unchecked, it won't be in 'map'. Says if we 'disable' a field, we click 'update', the enabled field won't be present in 'map', and then the field object will fill the default value 'true' in

4,List object failed

[qifeng-bai]

How to test:
1, You should be able to enable/disable a field / layer.
2, You can create a new field
3, Differentiate enabled/disabled fields

4, Delete a field no matter it is enabled or disabled
5, Fixed 'List object' function

[adam-collins]

This is for PR #226. Need to double check that more recent commits do not conflict.